This digital marketing glossary explains 264 of the most useful digital marketing terms and definitions in plain English, covering SEO, AI search, paid advertising, social media, email marketing, analytics and web design.
The language of digital marketing changes quickly. New platforms, AI tools and search features arrive every year, while older terms are renamed or retired. Use the A to Z links below to jump to a letter, and for the shorthand used on social platforms, see our guide to social media acronyms and abbreviations.
What is digital marketing?
Digital marketing is the promotion of products, services and brands through digital channels, including search engines, websites, email, social media, online advertising and, increasingly, AI assistants. Its main advantage over traditional marketing is measurement: almost every impression, click and conversion can be tracked, so budgets can move towards what works.
The core disciplines include search engine optimisation (SEO), paid search and social advertising, content marketing, email marketing, social media marketing and analytics. More recently, generative engine optimisation has emerged as brands work to appear in AI-generated answers as well as traditional search results.
Digital marketing glossary from A to Z
# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
#
301 redirect: A permanent redirect that sends visitors and search engines from one URL to another. It passes most of the original page’s ranking signals to the new address, so it is the right choice when a page moves for good.
302 redirect: A temporary redirect. It tells search engines the move is short term, so they keep the original URL indexed. Use it for maintenance or short campaigns, not for permanent moves.
404 error: The response a server returns when a page cannot be found. A few 404s are normal, but broken internal links that lead to them waste crawl budget and frustrate visitors.
410 status: A response that tells search engines a page has been removed on purpose and will not return. Google usually drops a 410 page from its index faster than a 404.
A
A/B testing: Showing two versions of a page, email, ad or button to different groups of people at the same time to see which performs better. Also called split testing. Change one variable at a time so you know what caused the difference.
Above the fold: The part of a web page visible without scrolling. The term comes from newspapers, where the top half of the front page carried the most important stories.
Ad blocker: Browser software or an extension that stops ads from loading. High ad blocker use in an audience is one reason brands invest in owned channels such as email and content.
Ad network: A platform that connects advertisers with websites and apps that sell ad space. The Google Display Network is the largest example.
AdSense: Google’s programme that lets website owners earn money by showing Google ads on their pages. It is the publisher side of Google’s advertising ecosystem.
Affiliate marketing: A model in which partners earn a commission for sales or leads they refer. Affiliates usually promote products through content, reviews, comparison sites or social media.
Affinity audience: An audience group based on long-term interests and habits, such as travel lovers or technology enthusiasts. Available in Google Ads and other platforms for awareness campaigns.
AI agent: An AI system that can plan and carry out tasks on its own, such as researching options, filling in forms or making a booking. As agents start acting on behalf of users, clear and machine-readable websites become more important.
AI Mode: Google’s conversational search experience, powered by Gemini. It breaks a question into several searches, combines the results and answers with links to its sources.
AI Overviews: AI-generated summaries that appear at the top of some Google results and link to the pages they draw on. Google explains how they work in its guidance on AI features. Studies show users click on organic results less often when an AI Overview appears.
Algorithm: The set of rules a platform uses to decide what to show. Search algorithms rank pages for a query, and social media algorithms decide which posts appear in each user’s feed.
Algorithm update: A change to how a search engine or social platform ranks content. Google makes thousands of small changes a year and several larger core updates that can shift rankings noticeably.
Allowlist: A list of approved senders, domains or IP addresses. In email marketing, asking subscribers to add you to their allowlist helps your messages avoid the spam folder. Formerly called a whitelist.
Alt text: A short text description added to an image in HTML. It is read aloud by screen readers, shown if the image fails to load and helps search engines and AI systems understand the image.
Analytics: The collection and analysis of data about how people find and use your website, apps and campaigns. Google Analytics 4 is the most widely used tool.
Anchor text: The clickable words in a hyperlink. Descriptive anchor text tells both users and search engines what the linked page is about.
Answer engine optimisation (AEO): Optimising content so it becomes the direct answer to a question in featured snippets, voice assistants and AI answers. It focuses on clear questions, concise answers and structured content. See how it compares in GEO vs SEO vs AEO.
Attribution: The process of assigning credit for a conversion to the channels and touchpoints that led to it. Different attribution models can tell very different stories about which channels work.
Average order value (AOV): Total revenue divided by the number of orders. Raising AOV through bundles, upsells or free delivery thresholds is often cheaper than finding new customers.
B
B2B: Business to business. Companies that sell products or services to other companies. B2B buying journeys are usually longer and involve more decision makers.
B2C: Business to consumer. Companies that sell directly to individual customers.
Backlink: A link from another website to yours. Links from relevant, trusted sites remain one of the strongest signals search engines use to judge authority.
Banner ad: A rectangular image or animated ad shown on websites, usually in standard sizes. Banner ads are the classic format of display advertising.
Banner blindness: The habit of ignoring anything on a page that looks like an ad. It is one reason native and content-led formats often outperform traditional banners.
Behavioural science: The study of how people think, decide and act, drawing on psychology, behavioural economics and sociology. In marketing, it is used to design messages, prices and customer journeys around how people really make choices. Read our guide to behavioural science in marketing.
Bing: Microsoft’s search engine. It also powers results for other services, including Yahoo and DuckDuckGo, and Bing data feeds into several AI assistants.
Black hat SEO: Tactics that try to manipulate search rankings in ways that break search engine guidelines, such as buying links or hiding text. They risk penalties and rarely last.
Blocklist: A list of senders, domains or IP addresses flagged for sending spam. Appearing on a major blocklist can stop your emails reaching inboxes. Formerly called a blacklist.
Blog: A section of a website that publishes regular articles. A well-run blog attracts search traffic, supports other channels and builds expertise over time.
BOFU (bottom of the funnel): The final stage of the buyer’s journey, when a prospect is ready to decide. BOFU content includes pricing pages, case studies, demos and free trials.
Bot: A software program that performs automated tasks online. Search engine crawlers are helpful bots, while spam bots and scrapers are not.
Bounce rate: The percentage of sessions that were not engaged. In Google Analytics 4, it is the opposite of engagement rate. A high bounce rate can mean a page does not match what visitors expected.
Brand mention: Any reference to your brand online, with or without a link. Mentions on trusted sites help search engines and AI systems understand and trust your brand.
Breadcrumbs: A navigation trail that shows where a page sits in a site’s structure, for example Home, Blog, Article. Breadcrumbs help users and search engines understand site hierarchy.
Buyer’s journey: The stages a person goes through before buying: awareness, consideration and decision. Good content strategies create useful content for each stage.
C
Cache: A stored copy of a web page or file that can be delivered quickly without being rebuilt each time. Caching makes websites faster and reduces server load.
Call to action (CTA): A prompt that tells the reader what to do next, such as Get in touch, Download the guide or Start your free trial. A clear CTA is one of the simplest ways to lift conversions.
Campaign: A coordinated set of marketing activities with a shared goal, message and time frame, often running across several channels.
Canonical tag: An HTML tag that tells search engines which version of a page is the main one when similar or duplicate versions exist. It helps consolidate ranking signals on the preferred URL.
Churn rate: The percentage of customers or subscribers who stop buying or cancel within a period. Reducing churn is often more profitable than acquiring new customers.
Citation (AI): A source that an AI assistant or AI search feature links to or names in its answer. Earning citations is the main goal of generative engine optimisation.
Citation (local SEO): An online mention of a business’s name, address and phone number, for example in directories. Consistent citations support local search rankings.
Clickbait: A headline or thumbnail designed to attract clicks through exaggeration or curiosity rather than accuracy. It may win the click but damages trust.
Click-through rate (CTR): The percentage of people who click after seeing a link, ad or email. It is calculated as clicks divided by impressions.
Click-to-open rate (CTOR): In email marketing, the percentage of people who opened an email and then clicked a link in it. It measures how engaging the content is.
Content management system (CMS): Software used to create and manage website content without writing code. WordPress is the most widely used CMS.
Content marketing: Attracting and keeping an audience by publishing useful content such as articles, guides, videos and tools, rather than relying only on advertising.
Conversion: Any valuable action a visitor completes, such as a purchase, sign-up, download or enquiry. What counts as a conversion depends on your goals.
Conversion path: The sequence of steps and touchpoints a visitor takes before converting, for example an ad, a landing page, a form and a thank-you page.
Conversion rate: The percentage of visitors who complete a conversion. It is calculated as conversions divided by visitors or sessions.
Conversion rate optimisation (CRO): Improving a website or landing page so a higher share of visitors convert, using data, user research and testing.
Cookie: A small file a website stores in the browser to remember information such as logins, preferences or analytics data. Under UK GDPR and PECR, non-essential cookies need consent.
Core update: A broad change to Google’s main ranking systems, released several times a year. Core updates reassess content quality in general rather than targeting specific tactics.
Core Web Vitals: Google’s three metrics for real-world user experience: Largest Contentful Paint (loading), Interaction to Next Paint (responsiveness) and Cumulative Layout Shift (visual stability). See web.dev for the current thresholds.
Cost per acquisition (CPA): The average cost of gaining one customer or conversion from a campaign. It is calculated as total spend divided by conversions.
Cost per click (CPC): The amount an advertiser pays each time someone clicks an ad. Used as a pricing model on Google Ads, Microsoft Advertising and social platforms.
Cost per lead (CPL): The average cost of generating one lead, such as a form submission or enquiry.
Cost per mille (CPM): The cost of 1,000 ad impressions. Mille is Latin for thousand. CPM is the standard pricing model for awareness campaigns.
Crawl budget: The number of pages a search engine is willing to crawl on a site within a given time. It matters most for large sites, where wasted crawling can delay indexing of important pages.
Crawler: An automated program that browses the web to discover and read pages for a search engine or AI system. Also called a spider or bot. Googlebot and GPTBot are examples.
CSS: Cascading Style Sheets. The code that controls how a web page looks, including colours, fonts, spacing and layout.
Cumulative Layout Shift (CLS): A Core Web Vital that measures how much page content moves unexpectedly while loading. A good CLS score is 0.1 or less.
Customer acquisition cost (CAC): The total cost of winning a new customer, including marketing and sales spend. Compare it with customer lifetime value to judge whether growth is profitable.
Customer lifetime value (CLV): The total revenue or profit a business can expect from a customer over the whole relationship. Also written as CLTV or LTV.
D
Dashboard: A visual display of key metrics in one place, used to track performance at a glance. Looker Studio is a popular free tool for marketing dashboards.
Data layer: A structured object on a website that stores information for tracking tools, such as product details or transaction values. It makes analytics more reliable than scraping data from the page.
Deep linking: Linking to a specific page or screen inside a website or app rather than the homepage. In apps, deep links take users straight to the relevant content.
Digital marketing: Marketing through digital channels such as search engines, websites, email, social media, online advertising and AI assistants, with the ability to measure results closely.
Digital PR: Earning coverage, mentions and links from online publications through newsworthy stories, data and expert commentary. It builds authority for both search engines and AI systems.
Display advertising: Visual ads, such as banners, images and video, shown on websites and apps rather than in search results.
Display network: A collection of websites and apps that show display ads. The Google Display Network reaches the majority of internet users worldwide.
DNS: Domain Name System. The system that translates a domain name such as kutola.co.uk into the IP address of the server that hosts the site.
Dofollow link: A standard link that passes ranking signals to the page it points to. There is no dofollow attribute; any link without a nofollow, sponsored or ugc attribute is treated this way.
Domain name: The address of a website, such as kutola.co.uk. It is registered through a domain registrar and renewed periodically.
Double opt-in: An email sign-up process in which new subscribers confirm their address by clicking a link. It improves list quality and provides clear evidence of consent.
Duplicate content: Substantial blocks of content that appear at more than one URL, on the same site or across sites. It can split ranking signals and make it harder for search engines to choose which page to show.
E
Ecommerce: Buying and selling products or services online.
E-E-A-T: Experience, expertise, authoritativeness and trustworthiness. The framework Google’s quality raters use to assess content, especially on topics that affect health, money or safety. Google describes it in its guide to creating helpful, reliable content.
Email automation: Emails sent automatically when a trigger occurs, such as a welcome series after sign-up, an abandoned basket reminder or a renewal notice.
Email list: The contacts who have agreed to receive your emails. A list you have built yourself, sometimes called a house list, is one of the most valuable assets a business owns.
Email marketing: Using email to share news, content and offers with customers and prospects. It consistently delivers one of the highest returns of any digital channel.
Engagement rate: A measure of how actively people interact with content. On social media it usually means interactions divided by reach or followers. In Google Analytics 4 it is the share of sessions that were engaged.
Entity: A distinct, well-defined thing, such as a person, company, place or concept, that search engines and AI systems can recognise and connect to other facts. Building a clear brand entity helps AI describe you accurately.
Evergreen content: Content that stays useful and relevant for a long time, such as guides and glossaries, rather than news that dates quickly.
F
Featured snippet: A highlighted answer shown at the top of some Google results, taken from a web page. Clear, concise answers to specific questions are most likely to be selected.
First-party data: Data a business collects directly from its own customers and audience, such as website behaviour, purchases and email engagement. It is becoming more valuable as third-party cookies decline.
Form fill: When a visitor completes and submits a form on a website, such as a contact or download form. Form fills are a common conversion for lead generation.
Frequency: The average number of times a person sees an ad in a given period. Too low and the message is forgotten; too high and people get annoyed.
Funnel: A model of the stages people move through from first hearing about a brand to becoming a customer. Often split into top, middle and bottom of the funnel.
G
GCLID: Google Click Identifier. A unique parameter Google Ads adds to URLs when someone clicks an ad, used to connect the click to later conversions.
Generative AI: AI that creates new content, such as text, images, audio or code, in response to a prompt. ChatGPT, Gemini and Claude are well-known examples.
Generative engine optimisation (GEO): The practice of improving how often and how accurately a brand is mentioned and cited in AI-generated answers from tools such as ChatGPT, Perplexity, Gemini and Google AI Overviews. Read our complete guide to generative engine optimisation, or see how it compares in GEO vs SEO vs AEO.
Geo-targeting: Showing ads or content to people based on their location, from a country down to a postcode or radius around an address.
Google Ads: Google’s advertising platform for search, display, YouTube, shopping and app campaigns. It was called Google AdWords until 2018.
Google Analytics 4 (GA4): The current version of Google Analytics. It measures events rather than page views, tracks users across websites and apps, and replaced Universal Analytics in 2023.
Google Business Profile: A free listing that shows a business’s details, reviews, photos and opening hours in Google Search and Maps. It was called Google My Business until 2021 and is central to local SEO.
Google Partner: A badge Google gives agencies and consultants that meet requirements for Google Ads certification, spend and performance.
Google Search Console: A free Google tool that shows how a site performs in search, including queries, clicks, indexing status and technical issues. It was called Google Webmaster Tools until 2015.
Google Tag Manager (GTM): A free tool for adding and managing tracking codes on a website without editing the site’s code each time.
Guerrilla marketing: Low-cost, unconventional marketing designed to surprise people and get attention, often in public spaces or through viral stunts.
Guest blogging: Writing articles for other websites to reach their audience and build authority. It works when the focus is quality and relevance, not simply earning links.
H
Hallucination: When an AI system states something false with confidence, such as an invented statistic or a wrong fact about a brand. Clear, consistent information across the web reduces the risk of being misrepresented.
Hard bounce: An email that cannot be delivered permanently, for example because the address does not exist. Hard-bounced addresses should be removed from your list straight away.
Hashtag: A word or phrase preceded by the # symbol that groups social media posts on the same topic and makes them easier to find.
Heading tags: HTML tags from H1 to H6 that structure a page’s content. The H1 is the main title; H2 and H3 tags divide the content into sections and help readers, search engines and AI systems scan it.
Heatmap: A visual report showing where visitors click, move and scroll on a page, with warmer colours indicating more activity.
Helpful content: Google’s term for content created primarily for people rather than to rank in search. Its ranking systems reward content that shows real expertise and satisfies the reader.
Hreflang: An HTML attribute that tells search engines which language and region a page is written for, so the right version appears in each country.
HTML: HyperText Markup Language. The code that structures the content of web pages, such as headings, paragraphs, links and images.
HTML email: An email designed with HTML and CSS, allowing images, colours, buttons and layouts. The alternative is a plain-text email.
HTTPS: The secure version of HTTP, the protocol that transfers data between a browser and a website. HTTPS encrypts that data and is a light ranking signal; browsers warn users about sites without it.
Hummingbird: A major Google algorithm update from 2013 that helped Google understand the meaning behind whole queries rather than matching individual keywords.
Hyperlink: A clickable link from one page or resource to another. Links are how users and crawlers move around the web.
I
Iframe: An HTML element that embeds another web page inside the current one, commonly used for videos, maps and forms.
Impression: One instance of an ad, post or search result being shown to someone, whether or not they interact with it.
Inbound marketing: Attracting customers with useful content and experiences they seek out, rather than interrupting them with outbound advertising.
Index: A search engine’s database of pages it has discovered and stored. A page must be indexed before it can appear in search results.
Indexing: The process of a search engine analysing a page and adding it to its index. Search Console shows which of your pages are indexed and why others are not.
Influencer marketing: Working with people who have trusted, engaged audiences on social media to promote a product or brand. Relevance and authenticity matter more than follower count.
Interaction to Next Paint (INP): A Core Web Vital that measures how quickly a page responds to clicks, taps and key presses. A good INP is 200 milliseconds or less.
Internal link: A link from one page to another on the same website. Internal links help users navigate, spread authority around the site and show search engines how content is related.
IP address: A unique number that identifies a device or server on the internet.
J
JavaScript: A programming language that makes web pages interactive, powering features such as menus, forms and animations. Content that relies heavily on JavaScript can be harder for some crawlers, including AI crawlers, to read.
K
Key performance indicator (KPI): A metric that shows progress towards a specific business goal, such as leads, revenue or retention. Good KPIs are few, clear and tied to outcomes.
Keyword: A word or phrase people type into search engines. Keyword research helps you understand what your audience is looking for and the language they use.
Keyword cannibalisation: When several pages on the same site target the same keyword and compete with each other, which can weaken rankings for all of them.
Keyword density: How often a keyword appears on a page compared with the total word count. It is no longer a meaningful ranking factor; writing naturally matters more.
Keyword difficulty: An estimate from SEO tools of how hard it would be to rank for a keyword, usually based on the strength of the pages already ranking.
Keyword stuffing: Overloading a page with keywords in an attempt to manipulate rankings. It harms readability and breaks Google’s spam policies.
Knowledge Graph: Google’s database of entities and the relationships between them. It powers knowledge panels and helps Google understand people, places, organisations and things.
Knowledge panel: An information box shown beside Google results for well-known entities, drawing on the Knowledge Graph.
L
Landing page: A page designed for a specific campaign or goal, where visitors arrive after clicking an ad, email or link. The best landing pages focus on one clear action.
Large language model (LLM): An AI model trained on vast amounts of text to understand and generate language. LLMs power tools such as ChatGPT, Claude, Gemini and Copilot.
Largest Contentful Paint (LCP): A Core Web Vital that measures how long the largest visible element, usually a main image or heading, takes to load. A good LCP is 2.5 seconds or less.
Lead: A person or organisation that has shown interest in your product or service, usually by sharing contact details.
Lead generation: Attracting potential customers and capturing their details so you can follow up. Common tactics include downloadable guides, webinars, quotes and free trials.
Lead magnet: Something valuable offered in exchange for contact details, such as a guide, template, checklist or tool. Also called a content offer.
Lead nurturing: Building relationships with leads over time through relevant emails and content until they are ready to buy.
Link building: Earning links from other websites to your own. Sustainable link building comes from content and stories other sites genuinely want to reference.
Link profile: The overall mix of links pointing to a website, including their quality, relevance, variety and anchor text.
LinkedIn: The largest professional social network, and a key channel for B2B marketing, thought leadership and recruitment.
LinkedIn Ads: LinkedIn’s advertising platform, which can target people by job title, industry, company size and seniority. Costs are higher than most social platforms, but so is B2B precision.
llms.txt: A proposed standard file placed at the root of a website that gives AI systems a concise, structured summary of the site’s most important content. The proposal is published at llmstxt.org. Adoption is growing, but its effect on AI visibility is still unproven.
Local SEO: Optimising a business to appear in local search results and on maps, through a strong Google Business Profile, reviews, citations and locally relevant content.
Long-tail keyword: A longer, more specific search phrase with lower volume but usually clearer intent, such as SEO consultant for B2B software companies.
Lookalike audience: An audience built by an ad platform to include people who share characteristics with your existing customers or subscribers.
LSI keywords: Short for latent semantic indexing keywords, a popular SEO idea that Google uses LSI to rank pages. Google does not use LSI; covering a topic thoroughly with natural, related language is what matters.
M
Map pack: The group of local business listings shown with a map in Google results for location-based searches, such as accountant near me. Also called the local pack.
Marketing automation: Software that runs repetitive marketing tasks automatically, such as email sequences, lead scoring and social posting, based on rules and triggers.
Marketing qualified lead (MQL): A lead that has shown enough interest, based on behaviour or fit, to be passed to more targeted marketing or to sales.
Medic update: A broad Google core update in August 2018 that hit many health, finance and other YMYL websites hard, increasing the focus on expertise and trust.
Medium: In analytics, the general category of a traffic source, such as organic, cpc, email or referral. Usually reported together with source.
Meta Ads Manager: Meta’s tool for creating, managing and reporting on ads across Facebook, Instagram, Messenger and WhatsApp.
Meta Business Suite: Meta’s free tool for managing Facebook and Instagram business accounts, including posting, messages and insights.
Meta description: An HTML tag that summarises a page. It is not a ranking factor, but it often appears as the snippet under the title in search results and affects click-through rate.
Meta keywords: An HTML tag once used to list a page’s keywords. Google has ignored it for ranking since 2009, so there is no need to use it.
Meta tags: HTML tags in a page’s head section that give browsers and search engines information about the page, such as the title, description and robots instructions.
Microsoft Advertising: Microsoft’s advertising platform for ads on Bing, other Microsoft properties and partner sites. It was called Bing Ads until 2019.
Mobile-first indexing: Google’s approach of using the mobile version of a website for indexing and ranking. It now applies to virtually all sites, so the mobile experience is the one that counts.
MOFU (middle of the funnel): The consideration stage, when prospects compare options. MOFU content includes comparison guides, case studies and webinars.
N
NAP: Name, address and phone number. Keeping a business’s NAP identical across its website, Google Business Profile and directories supports local search rankings.
Native advertising: Paid content that matches the look and feel of the platform it appears on, such as sponsored articles or in-feed social ads. It must still be clearly labelled as advertising.
Nofollow: A link attribute (rel=”nofollow”) that tells search engines not to pass ranking signals through a link. Google treats it as a hint. Related attributes include sponsored for paid links and ugc for user-generated content.
Noindex: An instruction, set in a meta tag or HTTP header, that tells search engines not to include a page in their index. Useful for thank-you pages, internal search results and thin pages.
O
Off-page SEO: Activities outside your own website that influence rankings, such as earning links, brand mentions, reviews and digital PR.
Omnichannel marketing: Coordinating marketing across all channels, online and offline, so customers get a consistent, connected experience wherever they interact with a brand.
On-page SEO: Optimising the content and HTML of individual pages, including titles, headings, copy, internal links, images and structured data.
Open rate: The percentage of recipients who open an email. Privacy features such as Apple Mail Privacy Protection inflate open rates, so clicks are now a more reliable measure.
Organic traffic: Visitors who arrive from unpaid search results rather than ads.
Orphan page: A page with no internal links pointing to it. Search engines and users struggle to find orphan pages, so they rarely perform well.
P
Page speed: How quickly a page loads and becomes usable. Faster pages improve user experience, conversions and Core Web Vitals scores.
PageRank: Google’s original algorithm for judging a page’s importance based on the links pointing to it. PageRank still exists inside Google’s systems, but the public score was retired in 2016.
Panda: A Google algorithm update first released in 2011 that demoted thin, low-quality and duplicate content. It later became part of Google’s core ranking systems.
Pay per click (PPC): An advertising model in which advertisers pay each time someone clicks their ad. Used on Google Ads, Microsoft Advertising and social platforms.
Penalty: A reduction in rankings or removal from search results, either from a manual action by Google’s team or from an algorithm that detects spam.
Penguin: A Google algorithm update first released in 2012 that targeted manipulative links. Since 2016 it has run in real time as part of the core algorithm.
People Also Ask: A box of related questions in Google results. Each question expands to show a short answer and a link to its source page.
Perceptual map: A chart that shows how customers perceive competing brands on two attributes, such as price and quality, revealing crowded positions and gaps in the market. Read our guide to the perceptual map.
Performance Max: A Google Ads campaign type that uses automation to run ads across Search, Display, YouTube, Gmail, Maps and Discover from a single campaign.
Persona: A semi-fictional profile of an ideal customer, based on research into their goals, challenges and behaviour. Personas keep marketing focused on real people.
Pillar page: A comprehensive page covering a broad topic that links to more detailed articles on related subtopics. Together they form a topic cluster.
Pop-up: A window that appears over a page, often to capture email addresses or show offers. Intrusive pop-ups, especially on mobile, can harm user experience and rankings.
Private blog network (PBN): A group of websites created to link to a target site and manipulate its rankings. It breaks Google’s spam policies and carries a high risk of penalties.
Programmatic advertising: Buying and selling digital ad space automatically through software and real-time auctions, rather than through manual deals.
Prompt: The instruction or question a user gives an AI tool. Understanding the prompts your audience uses is becoming as important as understanding their search keywords.
Q
Quality Score: Google Ads’ 1 to 10 rating of how relevant your keywords, ads and landing pages are. Higher Quality Scores lower costs and improve ad positions.
Query: The words someone types or says into a search engine or AI assistant.
Query fan-out: A technique used by AI search systems such as Google AI Mode, which split one question into several related searches, run them at once and combine the results into a single answer.
R
RankBrain: A machine learning system Google introduced in 2015 to help interpret searches, especially new or unusual queries, and match them with relevant pages.
Ranking: A page’s position in search results for a particular query. Rankings vary by location, device and personalisation, so they are best tracked as trends.
Reach: The number of unique people who saw a piece of content or ad at least once. Unlike impressions, each person is counted only once.
Real-time marketing: Creating content that responds quickly to current events, trends or conversations. Done well, it feels timely and relevant.
Reciprocal link: An arrangement in which two websites link to each other. Occasional natural reciprocal links are fine; large-scale link swaps break Google’s guidelines.
Reddit: A large network of topic-based communities. Reddit threads increasingly appear in Google results and are among the most cited sources in AI answers, which makes genuine participation valuable.
Redirect: An instruction that sends users and search engines from one URL to another automatically. See 301 redirect and 302 redirect.
Referral traffic: Visitors who arrive by clicking a link on another website, rather than from search engines, ads or direct visits.
Remarketing: Showing ads to people who have already visited your website or used your app. Also called retargeting.
Responsive web design: Building websites so the layout adapts to any screen size, from phones to large monitors.
Retrieval-augmented generation (RAG): A method in which an AI system looks up relevant documents, often through a live web search, before writing its answer. It is how AI search tools find and cite sources.
Return on ad spend (ROAS): Revenue generated for every pound spent on advertising. A ROAS of 4 means £4 in revenue for every £1 spent.
Return on investment (ROI): The profit from an activity compared with its cost, usually expressed as a percentage.
Rich results: Search results enhanced with extra visual information, such as star ratings, prices, images or FAQs, often made possible by structured data.
Robots.txt: A text file at the root of a website that tells crawlers which areas they may or may not access. It controls crawling, not indexing.
RSS feed: A file that publishes a site’s latest content in a standard format, so people and apps can follow updates automatically.
S
Sales qualified lead (SQL): A lead that the sales team has reviewed and judged ready for direct sales follow-up.
Schema markup: Structured data code, based on the Schema.org vocabulary, that describes a page’s content in a way search engines and AI systems can read, such as an organisation, article, product or FAQ.
Search engine: A system that finds, organises and ranks information on the web in response to queries. Google, Bing and DuckDuckGo are the best known.
Search engine marketing (SEM): Marketing that aims to increase visibility in search engines. The term usually refers to paid search advertising, though it sometimes includes SEO.
Search engine optimisation (SEO): Improving a website so it earns more visibility and traffic from unpaid search results. SEO covers technical foundations, content, on-page optimisation and authority.
Search engine results page (SERP): The page a search engine shows in response to a query, including organic results, ads, AI Overviews, maps and other features.
Search intent: The purpose behind a search: informational (learning), navigational (finding a specific site), commercial (comparing options) or transactional (buying). Matching intent is essential for ranking.
Search network: The ad placements shown in search engine results and on partner search sites.
Search operator: A command added to a search to refine results, such as site: to search within one website or quotation marks to find an exact phrase.
Search volume: The estimated number of times a keyword is searched in a given period, usually monthly.
Segmentation: Dividing an audience into groups based on shared characteristics or behaviour, so you can send more relevant messages.
SERP features: Anything in search results beyond standard blue links, such as featured snippets, People Also Ask, AI Overviews, image packs and local packs.
Server-side tracking: Collecting analytics and conversion data through your own server instead of only in the visitor’s browser. It improves data accuracy and control.
Session: A group of interactions one user has with a website in a given time frame. In Google Analytics 4, a session ends after 30 minutes of inactivity by default.
Sitelinks: Additional links to other pages of a site that appear under the main result in search, helping users jump to specific sections.
Slug: The part of a URL that identifies a specific page, such as digital-marketing-glossary-of-terms. Short, descriptive slugs work best.
Smarketing: The alignment of sales and marketing teams around shared goals, definitions and processes.
Social commerce: Selling products directly within social media platforms, such as Instagram Shopping or TikTok Shop.
Social listening: Monitoring social media and the wider web for mentions of your brand, competitors and industry to understand sentiment and spot opportunities.
Social media marketing: Using social platforms to build awareness, engage audiences and drive traffic or sales, through both organic posts and paid ads.
Social media SEO: Optimising social media profiles and content so they can be found through search on platforms such as TikTok, Instagram, YouTube and LinkedIn, as well as in Google and AI answers. Also called social SEO. Read our guide to social media SEO.
Social proof: The tendency to follow what other people do when deciding what to do ourselves. In marketing, it includes reviews, ratings, testimonials, case studies and customer numbers. Read our guide to social proof.
Social selling: Using social networks, especially LinkedIn, to find, connect with and build relationships with prospects.
Soft bounce: A temporary email delivery failure, for example because the recipient’s inbox is full. Repeated soft bounces should be treated like hard bounces.
Source: In analytics, the origin of a visit, such as google, newsletter or linkedin.com. Usually reported together with medium.
Spam: Unwanted or unsolicited messages, or content created to manipulate search rankings. Google’s spam policies define what it treats as spam.
SSL certificate: A digital certificate that enables HTTPS by encrypting data between a browser and a server. Free certificates are widely available, so every site should have one.
Structured data: Information organised in a standard format that machines can read easily. On websites, it is usually added as schema markup in JSON-LD.
T
Technical SEO: Optimising a website’s infrastructure so search engines can crawl, render and index it efficiently, including site speed, architecture, redirects, sitemaps and structured data.
Thank-you page: The page visitors see after completing a conversion, such as a form or purchase. It is a useful place to set expectations and track conversions.
Third-party cookie: A cookie set by a domain other than the website being visited, usually for advertising and cross-site tracking. Browsers increasingly restrict them, pushing marketers towards first-party data.
Title tag: The HTML element that defines a page’s title. It appears in browser tabs and usually as the clickable headline in search results, making it one of the most important on-page elements.
TOFU (top of the funnel): The awareness stage, when people first discover a problem or a brand. TOFU content includes blog posts, guides, videos and social content.
Topic cluster: A group of related pages linked to a central pillar page. Clusters help search engines understand your depth on a subject and build topical authority.
Topical authority: The perceived expertise of a website on a subject, built by covering it in depth across many connected, high-quality pages.
Tracking code: A snippet of code added to a website to collect data for analytics or advertising platforms, such as the Google tag or the Meta Pixel.
U
Unique visitors: The number of distinct people who visited a website in a given period. In Google Analytics 4 this is reported as users.
URL: Uniform Resource Locator. The full address of a page on the web, such as https://kutola.co.uk/blog/.
User experience (UX): How easy, useful and satisfying a website or product is to use. Good UX supports conversions, loyalty and search performance.
User interface (UI): The visual and interactive elements people use to navigate a website or app, such as buttons, menus and forms.
User-generated content (UGC): Content created by customers or users rather than the brand, such as reviews, social posts, photos and forum answers.
UTM parameters: Tags added to the end of a URL, such as utm_source and utm_campaign, that tell analytics tools exactly where a visit came from.
V
Viral: Content that spreads rapidly as people share it widely. Virality is hard to plan, but useful, emotional or surprising content has the best chance.
Voice search: Searching by speaking to a device or assistant, such as Google Assistant, Siri or Alexa. Voice queries are usually longer and phrased as questions.
W
Web design: Planning and creating the look, structure and usability of websites.
Web hosting: A service that stores a website’s files on a server and makes them available online. Hosting quality affects speed, uptime and security.
Webinar: An online seminar or presentation delivered live or on demand. Webinars are popular for B2B lead generation.
White hat SEO: SEO that follows search engine guidelines and focuses on real value for users, such as quality content, good technical foundations and earned links.
Wireframe: A simple layout sketch of a web page that shows structure and content placement before visual design begins.
Word-of-mouth marketing: When customers recommend a brand to others through conversations, reviews and social media. It is one of the most trusted forms of marketing.
Workflow: An automated sequence of marketing actions, such as a series of emails triggered by a sign-up. Also called a drip campaign.
X
X (formerly Twitter): A real-time social network for short posts, news and public conversation, renamed from Twitter in 2023. X Ads is its advertising platform.
XML sitemap: A file that lists a website’s important URLs to help search engines discover and crawl them. It should be submitted in Google Search Console and Bing Webmaster Tools.
Y
YMYL: Your money or your life. Google’s term for topics that can significantly affect health, finances, safety or wellbeing. YMYL content is held to higher standards of expertise and trust.
YouTube: The largest video platform and the second most visited website in the world. YouTube videos also appear frequently in Google results and AI answers.
YouTube Ads: Video and display ads that run on YouTube, including skippable, non-skippable and short bumper ads, managed through Google Ads.
Z
Zero-click search: A search that ends without the user clicking through to a website, because the answer appears directly in the results, for example in a featured snippet or an AI Overview.
Zero-party data: Data customers share with a business intentionally, such as preferences, quiz answers or survey responses.
Frequently asked questions
What is a digital marketing glossary?
A digital marketing glossary is a reference list of the terms, acronyms and concepts used in digital marketing, each with a short definition. It helps marketers, business owners and students understand the language used across SEO, advertising, social media, email and analytics.
What are the most important digital marketing terms to know?
Start with the terms that describe how people find and act on your marketing: SEO, PPC, click-through rate, conversion rate, landing page, call to action, search intent and ROI. Today, AI search terms such as AI Overviews and generative engine optimisation (GEO) are just as important.
What is the difference between SEO and SEM?
SEO (search engine optimisation) improves visibility in unpaid search results. SEM (search engine marketing) usually refers to paid search advertising, such as Google Ads, although it is sometimes used as an umbrella term that includes SEO.
What is the difference between SEO and GEO?
SEO aims to rank pages in traditional search results and earn clicks. GEO aims to get a brand mentioned and cited in AI-generated answers from tools such as ChatGPT, Perplexity and Google AI Overviews. The two overlap heavily, and strong SEO is the foundation for GEO.
How often is this glossary updated?
We review this glossary regularly and update it when platforms rename products, retire features or introduce new concepts, particularly in AI search, where the vocabulary is changing fastest.
Put the terms into practice
Knowing the vocabulary is the first step. Kutola helps brands turn it into results, from SEO and AI search visibility to content strategy and international campaigns.