Semantic SEO is an approach to content and site structure that prioritizes the context, meaning, and intent behind a search query over matching the literal keyword string. It means writing content that thoroughly covers a topic — including related subtopics, common questions, and relevant terminology — rather than repeating one target phrase throughout a page.
In practice, this often takes the form of topic clusters: one comprehensive pillar page covering a broad subject, connected to several more specific subtopic pages that each go deeper on a piece of it, all interlinked to reinforce the relationship between them.