Hans-Jürgen Schönig performs a search:
PostgreSQL offers advanced capabilities through extensions like pgvector, which enable semantic search at a level and quality never achieved before. Unlike traditional text search, which mostly relies on trivial string comparison, semantic search in PostgreSQL goes beyond keywords by understanding context and meaning, enhancing relevance.
The quick idea here is that converting words (or parts of words) into vectors can maintain most of the semantic meaning behind the words. Then, when we perform certain types of vector comparisons, we can take advantage of this semantic meaning and find results whose language is different from our query but the concept is a match for what we want. Click through for the full article.