SEO for LLMs is most commonly called GEO, which stands for generative engine optimization. That is the term you will see used across the industry when people talk about influencing visibility inside AI responses from tools like ChatGPT, Perplexity, and others.
In practice, the strategy for LLMs does not branch far from traditional SEO. LLMs do not maintain a separate index of the web in the same way search engines do. They rely heavily on traditional search engines and other web sources to gather fresh information, often through systems that expand a query into multiple searches to find and validate answers. If you want your site to be listed, cited, or referenced by an LLM, you need a strong SEO foundation first.
That means building topical authority, publishing content that matches real search demand, and improving what is already working by analyzing queries in Google Search Console. You can also use tools like Semrush or Ahrefs to uncover new topics, gaps, and competitors. GEO is the label, but many GEO pitches are simply tool sales. The basics have stayed the same.