Keywords are dead. Long live concepts. Semantic search is the ability of search engines to understand the intent and contextual meaning of terms, rather than just matching keywords.
Vector Embeddings & You
Modern search engines use "vector embeddings" to map words to concepts in a multi-dimensional space. To rank, your content needs to be semantically close to the user's query vector.
Writing for Semantics
Stop keyword stuffing. Start topic clustering. Cover a topic exhaustively. Use synonyms, related terms, and natural language. The more comprehensively you cover a "topic entity," the higher your semantic authority becomes.