01 · Understand the idea
In simple words
Keyword search looks for matching words. Semantic search tries to retrieve material related to the meaning of your question. If a student asks “how do I begin with machine learning?”, a useful result might be titled “ML foundations”. You still need to test whether the returned material is relevant to the learner.
Two useful terms
Retrieval: finding candidate documents. Ranking: arranging candidates from most to least useful according to a score.
Build your understanding
Semantic search retrieves content using representations of meaning. Useful search still needs a clear relevance definition. For an AI learning site, a query for beginner material should not return an advanced paper solely because it shares vocabulary. Combine relevance checks with filters and access permissions.
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