An llms.txt file is an optional list of selected website pages, usually placed at the site's root. Some AI tools may read it to find useful pages, but adoption varies.
The file can point to product pages, pricing, or documentation. It is a suggestion to tools that choose to read it, not a way to require crawlers to visit those pages or cite them.
It is usually written in Markdown with a short site description and links grouped by topic. It does not replace a sitemap or the pages themselves.
PingAura offers a generator that drafts the file for a website. A team should review the suggested links before publishing it.
Google says llms.txt is not needed for Google Search and does not improve or harm visibility there. Other services may use the file, so its value depends on the tool being considered.
Unlike llms.txt, robots.txt tells compliant crawlers which pages they may fetch. Neither file is a guarantee of AI citations.