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Glossary

GEO glossary

Short, clear definitions of the key AI search terms.

GEO

Generative Engine Optimization

The work of making your brand's content understood and trusted by generative answer engines such as ChatGPT, Gemini and Perplexity, so they mention it or cite it in their answers.

AEO

Answer Engine Optimization

Optimizing content so it is chosen as the direct answer in short-form answers, whether Google snippets, voice assistants or AI tools.

SEO

Search Engine Optimization

A set of practices for raising a site's ranking in search engines such as Google, covering content, technical structure, links and user experience.

LLM

Large Language Model

An AI system trained on huge amounts of text to understand and generate language.

AI Overviews

AI Overviews

A Google Search feature that shows an AI-written summary above the search results, with links to the sources it was built from.

AI Mode

AI Mode

A conversational search experience in Google that answers with AI and allows follow-up questions, while showing links to its sources.

Citation

Citation

When an AI tool names your brand or site as the source of a fact in its answer, usually with a link or a name.

Entity

Entity

A specific, well-known thing that engines can recognize and tell apart from others, such as a company, person, product or place.

Schema Markup

Schema Markup

Code added to a page, usually in JSON-LD with schema.org vocabulary, that tells engines exactly what kind of content it is, such as a product, article, FAQ or organization.

llms.txt

llms.txt file

A proposed text file placed at the site root that introduces language models to the site and its key pages.

E-E-A-T

Experience, Expertise, Authoritativeness, Trustworthiness

A framework Google uses in its search quality rater guidelines to describe what it values in content.

RAG

Retrieval-Augmented Generation

An approach where the tool first retrieves relevant pages or documents, then the model writes its answer based on them.

Zero-click Search

Zero-click Search

When a user gets their answer inside the search page or the AI tool without clicking any site.

Knowledge Graph

Knowledge Graph

A knowledge base Google maintains about entities and the relationships between them, used to show direct information about companies, people and places.

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