Glossary: GEO, SEO, ads, websites and AI
Plain-language definitions of the terms you meet when you order a website, ads, SEO or an AI assistant. Each entry has an example and the mistakes people make most often.
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AI agent
An AI agent is a program built on a language model that does not just answer but acts: it plans steps and uses tools — a CRM, a calendar, email, a database — to complete a task on its own.
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AI Overviews (Google)
AI Overviews are AI-generated summaries that Google shows at the top of some search results, with links to the pages the summary draws on.
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AI visibility
AI visibility is how often and how accurately AI assistants such as ChatGPT, Gemini and Perplexity name a business when people ask them for a recommendation in its field.
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API and integration
An API is a documented way for one program to exchange data with another; an integration uses APIs to connect services — a website, a CRM, payments, a messenger — so data moves between them automatically.
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Chatbot
A chatbot is a program that talks with people in a messenger, on a website or in an app: it answers questions, takes orders or bookings and passes complex cases to a person.
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CMS (content management system)
A CMS is software with an admin panel that lets you add and edit pages, texts, photos and prices on a website without writing code; WordPress is the best-known example.
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Conversion rate
Conversion rate is the share of visitors who do the target action — send a request, call, buy — out of all visitors, usually shown as a percentage.
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Core Web Vitals
Core Web Vitals are Google’s three metrics of real user experience on a page: how fast the main content appears (LCP), how quickly the page reacts to input (INP) and how much the layout shifts while loading (CLS).
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CPC (cost per click)
CPC is how much an advertiser pays on average for one click on an ad; on most ad platforms it is set in an auction and changes with competition.
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CPL (cost per lead)
Cost per lead is the ad spend divided by the number of leads — requests, calls or sign-ups — the campaign brought in.
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CRM (customer relationship management)
A CRM is a system that keeps all customers and deals in one place: contacts, requests, conversation history, stages of each deal and tasks for the team.
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Cross-platform app
A cross-platform app is a mobile app built from one codebase — for example with React Native or Flutter — that runs on both iOS and Android.
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CTR (click-through rate)
CTR is the share of people who click a link, an ad or a search result out of everyone who saw it: clicks divided by impressions.
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Design system
A design system is a shared set of reusable components — buttons, forms, cards — with rules for colours, type and spacing, so every new page or screen looks and works consistently.
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E-E-A-T (experience, expertise, authoritativeness, trustworthiness)
E-E-A-T is the set of qualities Google’s search quality guidelines use to judge content: experience, expertise, authoritativeness and trustworthiness, with trust the most important.
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GEO (Generative Engine Optimization)
GEO is work on a website, its content and its mentions elsewhere so that AI assistants such as ChatGPT, Gemini and Perplexity understand a business correctly and can name it in their answers.
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Landing page
A landing page is a single web page built around one offer and one action — usually a request, a call or a purchase — often used as the destination of an ad campaign.
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LLM (large language model)
A large language model is an AI system trained on huge amounts of text that predicts and writes language; it powers ChatGPT, Gemini, Claude and most AI assistants and chatbots.
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llms.txt
llms.txt is a proposed plain-text file at the root of a website (/llms.txt) that gives AI tools a short, structured summary of the site and links to its key pages.
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Responsive design
Responsive design means a website adapts its layout to any screen — phone, tablet or desktop — so the same page stays readable and easy to use everywhere.
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Retargeting (remarketing)
Retargeting is showing ads to people who have already interacted with a business — visited the site, watched a video, added to cart — to bring them back.
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Schema markup (structured data)
Schema markup is code added to a page, usually in JSON-LD format and using the schema.org vocabulary, that tells search engines and AI systems exactly what the page is about: an organization, a product, an article, an FAQ.
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SEO (search engine optimization)
SEO is work on a website — its structure, speed, content and links — so that search engines like Google show it higher for the queries its customers type.
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SERP (search engine results page)
A SERP is the page a search engine shows in response to a query: ads, the organic results and extra blocks such as maps, questions, images or AI-generated answers.
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SMM (social media marketing)
SMM is the planned, regular running of a business’s social media to win customers: posts, short videos and replies.
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UI/UX design
UI (user interface) is what people see and tap: screens, buttons, text and colours.
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Website audit
A website audit is a structured check of a site — speed, phone layout, search basics, technical errors and how easy it is to contact the business — that ends with a ranked list of fixes.
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