AI search comes with new terms, new signals, and new optimization concepts. This glossary explains the most important words in simple language so website owners, marketers, and SEO teams can understand the future of search more clearly.
Use this glossary as a quick reference while working on AI visibility, LLM optimization, ChatGPT SEO, AI crawlability, LLMs.txt, schema, and answer engine optimization.
AI visibility means how easily AI platforms like ChatGPT, Gemini, Claude, Perplexity, and Copilot can discover, understand, mention, cite, or recommend your website in generated answers.
In traditional SEO, visibility often means ranking on Google. In AI search, visibility can mean being included inside an AI answer, appearing as a source, or being mentioned as a recommended brand.
GEO stands for Generative Engine Optimization. It is the process of improving your content and website structure so generative AI engines can understand, cite, and recommend your brand.
GEO focuses on clear answers, entity signals, structured data, citations, topical authority, and AI-friendly content formatting.
AEO means Answer Engine Optimization. It is the practice of creating content that directly answers user questions in a way search engines and AI systems can easily extract.
FAQs, short definitions, step-by-step explanations, comparison tables, and clear headings all support AEO.
LLM SEO means optimizing your website for large language models. It focuses on making your content easier for AI systems to understand, summarize, classify, and recommend.
LLM SEO includes content clarity, crawlability, schema markup, author information, brand consistency, internal links, and helpful answer-style content.
LLMs.txt is a text file placed at /llms.txt that can guide AI systems toward your most important pages, tools, guides, documentation, and resources.
It does not replace a sitemap or robots.txt, but it can help provide a cleaner content roadmap for AI systems and language models.
GPTBot is a web crawler associated with OpenAI systems. Website owners can use robots.txt rules to allow or block GPTBot access to their site.
Checking GPTBot access is useful if you want to understand whether your website may be accessible to OpenAI-related crawling systems.
AI crawlability means how easily AI crawlers and search crawlers can access and read your website content.
Crawlability depends on robots.txt, sitemap availability, page status codes, internal links, server response, HTML structure, and whether important pages are blocked.
Schema markup is structured data added to a webpage to help search engines and AI systems understand page meaning more clearly.
Common schema types include Organization, Article, FAQ, Breadcrumb, Product, LocalBusiness, Review, and SoftwareApplication schema.
Entity signals help AI systems understand real-world things such as a brand, person, product, service, location, or topic.
Consistent brand naming, author details, organization schema, About pages, internal links, and external mentions can strengthen entity understanding.
AI citations are references or source links shown by AI answer platforms when they use information from a website.
Not every AI system shows citations, but websites with helpful, trustworthy, well-structured content may have a better chance of being referenced when AI platforms provide sources.
An answer engine is a search experience that gives users direct answers instead of only listing websites. AI assistants and AI search tools often behave like answer engines.
Topical authority means your website has enough useful content around a specific subject to be seen as a reliable source.
For example, LLMrush builds topical authority around AI visibility, GEO, LLM SEO, AI crawlability, and LLMs.txt.
Robots.txt is a file that tells crawlers which parts of a website they may or may not access. It is located at /robots.txt.
A wrong robots.txt rule can block search engines or AI crawlers from important pages, which may reduce visibility.
Structured content is content organized with clear headings, summaries, lists, FAQs, sections, and logical flow.
It helps humans read faster and helps AI systems understand the main topic, subtopics, and answers on the page.
Brand mentions are references to your company, product, or website across the web. They may or may not include a backlink.
Consistent brand mentions can help search engines and AI systems connect your brand with specific topics and expertise areas.
Use LLMrush to audit your AI visibility, crawlability, schema, GPTBot access, LLMs.txt file, and other signals that help AI systems understand your website.
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