This glossary defines the terms used across SEO for LLM, in plain language.
| Term | Meaning |
|---|---|
| GPTBot | OpenAI's crawler for collecting content that may be used for model training. |
| OAI-SearchBot | OpenAI's crawler for including pages in ChatGPT search results. |
| ChatGPT-User | The agent that fetches a page when a ChatGPT user triggers it. |
| ClaudeBot / Claude-SearchBot / Claude-User | Anthropic's training crawler, search crawler and user-triggered fetcher. |
| PerplexityBot / Perplexity-User | Perplexity's search crawler and its user-triggered fetcher. |
| Google-Extended | A robots.txt token controlling use of content for some Google AI products. Google says it does not affect inclusion in Google Search. |
| Googlebot / bingbot | The classic search crawlers behind Google and Bing. |
| robots.txt | A file telling crawlers which paths they may fetch. It states a policy and does not enforce it. |
| llms.txt | A proposed text file describing a site for language models. Not a confirmed ranking signal. |
| Grounding | Giving a model fresh search results so its answer can cite sources. |
| Query fan-out | Splitting one question into several related searches. |
| Citation | A source linked or named inside an AI answer. |
| GEO | Generative engine optimization: making content easier for AI engines to find and cite. |
See the methodology for how we label evidence and the data page for our tests.