# Citeme GEO Glossary > Every term of AI search, defined. **Entries:** 19 [Version HTML](https://www.citeme.io/lexique) --- Append `.md` to any article URL to get its Markdown source. The HTML version of each page is linked at the top of the file. ## Entries - [AEO](https://www.citeme.io/lexiques/aeo) ([md](https://www.citeme.io/lexiques/aeo.md)) — 2026-06-11 AEO (Answer Engine Optimization) focuses on getting your content selected as direct answers in featured snippets and AI responses. Learn how AEO and GEO connect. - [AI Agent](https://www.citeme.io/lexiques/ai-agent) ([md](https://www.citeme.io/lexiques/ai-agent.md)) — 2026-06-11 An AI agent is an autonomous system that plans, reasons, and uses tools to complete multi-step tasks. Learn how AI agents reshape content strategy and GEO. - [AI Bot](https://www.citeme.io/lexiques/ai-bot) ([md](https://www.citeme.io/lexiques/ai-bot.md)) — 2026-06-11 An AI bot is a software program powered by artificial intelligence that performs tasks autonomously. Learn about AI crawler bots and their role in GEO strategy. - [AI Hallucination](https://www.citeme.io/lexiques/ai-hallucination) ([md](https://www.citeme.io/lexiques/ai-hallucination.md)) — 2026-06-11 An AI hallucination is when an AI model generates false information confidently. Learn how hallucinations affect brand visibility, sales, and GEO strategy in 2026. - [Artificial Intelligence](https://www.citeme.io/lexiques/artificial-intelligence) ([md](https://www.citeme.io/lexiques/artificial-intelligence.md)) — 2026-06-11 Artificial intelligence is the field of building systems that perform human-like cognitive tasks. Discover how AI powers modern search, GEO, and marketing. - [ChatGPT](https://www.citeme.io/lexiques/chatgpt) ([md](https://www.citeme.io/lexiques/chatgpt.md)) — 2026-06-11 ChatGPT is the most cited AI search engine in 2026. Learn how ChatGPT works, why it matters for GEO, and how brands earn citations inside ChatGPT answers. - [Citations](https://www.citeme.io/lexiques/citations) ([md](https://www.citeme.io/lexiques/citations.md)) — 2026-06-11 Citations in AI search are references that models like ChatGPT and Perplexity attribute to your content. Learn how to earn more AI citations with GEO optimization. - [Claude](https://www.citeme.io/lexiques/claude) ([md](https://www.citeme.io/lexiques/claude.md)) — 2026-06-11 Claude is the family of large language models developed by Anthropic. Built around Constitutional AI, Claude models (Haiku, Sonnet, Opus, Fable) power assistants, autonomous agents and AI search engines that cite third-party sources, making Claude a critical visibility channel for GEO. - [Crawl](https://www.citeme.io/lexiques/crawl) ([md](https://www.citeme.io/lexiques/crawl.md)) — 2026-06-11 A crawl is the automated process by which bots discover and index web pages. Learn why crawling is essential for both SEO rankings and AI citation visibility. - [Fan-out queries](https://www.citeme.io/lexiques/fan-out-queries) ([md](https://www.citeme.io/lexiques/fan-out-queries.md)) — 2026-06-11 Fan-out queries let AI search engines split one question into multiple sub-queries to build a fuller answer. Here's how they work and why they matter for GEO. - [GEO (Generative Engine Optimization)](https://www.citeme.io/lexiques/geo-generative-engine-optimization) ([md](https://www.citeme.io/lexiques/geo-generative-engine-optimization.md)) — 2026-06-11 GEO (Generative Engine Optimization) is the practice of optimizing content to be cited by AI platforms like ChatGPT, Perplexity, and Gemini. Learn how it works. - [Gemini](https://www.citeme.io/lexiques/gemini) ([md](https://www.citeme.io/lexiques/gemini.md)) — 2026-06-11 Gemini is Google's multimodal AI powering AI Overviews in Search and Workspace. Learn how it selects content and why it matters for your GEO strategy. - [LLM](https://www.citeme.io/lexiques/llm) ([md](https://www.citeme.io/lexiques/llm.md)) — 2026-06-11 A LLM is a large language model behind ChatGPT, Claude, Gemini, and Perplexity. Learn how LLMs work, why they matter for GEO, and how to optimize for LLM citations. - [Mount AI](https://www.citeme.io/lexiques/mount-ai) ([md](https://www.citeme.io/lexiques/mount-ai.md)) — 2026-08-04 Mount AI is the mountain-shaped traffic curve of sites flooded with unedited AI content: a fast climb, then a brutal collapse at the next Google core update. Definition, mechanics and how to avoid it. - [Parasite SEO](https://www.citeme.io/lexiques/parasite-seo) ([md](https://www.citeme.io/lexiques/parasite-seo.md)) — 2026-08-10 Parasite SEO means publishing on a third-party domain to borrow its authority. Google penalises it as site reputation abuse. What still works in 2026, and why it builds no asset. - [Perplexity](https://www.citeme.io/lexiques/perplexity) ([md](https://www.citeme.io/lexiques/perplexity.md)) — 2026-06-11 Perplexity is an AI-powered answer engine combining real-time web search with cited responses. Learn how to optimize your content to be cited by Perplexity. - [RAG](https://www.citeme.io/lexiques/rag) ([md](https://www.citeme.io/lexiques/rag.md)) — 2026-06-11 RAG (Retrieval-Augmented Generation) combines LLM generation with real-time information retrieval. Learn how RAG powers AI citations and why it matters for GEO. - [SEO (Search Engine Optimization)](https://www.citeme.io/lexiques/seo-search-engine-optimization) ([md](https://www.citeme.io/lexiques/seo-search-engine-optimization.md)) — 2026-06-11 SEO (Search Engine Optimization) improves your website's visibility in organic search results. Learn its three pillars and how it connects to GEO in 2026. - [llms.txt](https://www.citeme.io/lexiques/llms-txt) ([md](https://www.citeme.io/lexiques/llms-txt.md)) — 2026-06-11 llms.txt is a standard file that tells AI crawlers how to access and use your content. Learn how llms.txt works, why it matters for GEO, and how to set it up.