llms.txt is a plain-text file placed at the root of your domain that helps AI language models understand and cite your content accurately. Similar to robots.txt, it provides structured guidance to AI crawlers and LLM training pipelines about your most important pages, brand identity, and preferred summary text.

Major AI platforms including ChatGPT's web browsing mode, Perplexity, and Bing Copilot are beginning to respect this convention. Early adopters gain a citation advantage as AI-driven search continues to grow.

When an LLM crawls your domain before generating an answer, it looks for an authoritative summary of your site. An llms.txt file surfaces that summary directly, improving the accuracy and frequency of mentions in AI-generated responses — a ranking signal for the era of answer engines.

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