# AI Search & Answer Engines

ChatGPT, Perplexity, and Google’s AI Overviews answer questions directly and cite a few sources. Learn how these systems pick sources and how businesses become one of them.

- Canonical URL: https://movermarketing.ai/learn/ai-search
- Learning Center: https://movermarketing.ai/learn
- Related service: [ChatGPT & AI search visibility](https://movermarketing.ai/services/ai-search-visibility)

## Articles

- [What is answer engine optimization (AEO)?](https://movermarketing.ai/learn/ai-search/what-is-answer-engine-optimization) — [Markdown](https://movermarketing.ai/learn/ai-search/what-is-answer-engine-optimization.md): Answer engine optimization (AEO) is the practice of making a business's content easy for AI search tools such as Google's AI Overviews, ChatGPT, and Perplexity to find, understand, and cite in their answers.
- [How do businesses rank in ChatGPT and get recommended?](https://movermarketing.ai/learn/ai-search/how-to-get-recommended-by-chatgpt) — [Markdown](https://movermarketing.ai/learn/ai-search/how-to-get-recommended-by-chatgpt.md): ChatGPT recommends and cites businesses using pages it finds through its search features, so a business has to let OpenAI's search crawler reach its site and publish clear, accurate information that answers the questions customers ask.
- [What is llms.txt?](https://movermarketing.ai/learn/ai-search/what-is-llms-txt) — [Markdown](https://movermarketing.ai/learn/ai-search/what-is-llms-txt.md): llms.txt is a proposed Markdown file, placed at a website's root or a subpath, that gives AI agents a short overview of the site and links to clean, LLM-friendly versions of its most useful pages.
- [What is generative engine optimization (GEO)?](https://movermarketing.ai/learn/ai-search/what-is-generative-engine-optimization) — [Markdown](https://movermarketing.ai/learn/ai-search/what-is-generative-engine-optimization.md): Generative engine optimization (GEO) is a term from a 2023 research paper for making content more visible in AI-generated answers, and Google says that for its own AI features the work is still SEO.
- [How Google AI Overviews and AI Mode choose sources](https://movermarketing.ai/learn/ai-search/how-ai-overviews-work) — [Markdown](https://movermarketing.ai/learn/ai-search/how-ai-overviews-work.md): Google's AI Overviews and AI Mode build answers from pages in Google's search index, using its core ranking systems and related 'fan-out' searches, so a page must be indexed and eligible for a snippet to be cited.
- [What are AI crawlers?](https://movermarketing.ai/learn/ai-search/what-are-ai-crawlers) — [Markdown](https://movermarketing.ai/learn/ai-search/what-are-ai-crawlers.md): AI crawlers are bots that AI companies use to collect web pages for model training, to build AI search results, or to fetch a page when a user asks, and site owners control most of them separately through robots.txt.