LLM optimization (LLMO) is the practice of making a website technically readable and retrievable by large language models and the AI systems built on them. It focuses on the machine-readability layer: allowing AI crawlers to access your site, serving content that does not depend on JavaScript to render, and structuring pages so models can parse them.
For brands, LLMO is the foundation beneath content and authority work. If an AI system cannot crawl and read your pages, no amount of good content or off-site presence will get you surfaced, which is why this technical layer comes first.