FREE GUIDES · 27 OCT 2026
Vector search and keyword search: 10 algorithms behind RAG retrieval
How vector search (HNSW, IVF-PQ, DiskANN, ScaNN and more) and keyword search (BM25, TF-IDF) find the right chunk, what each trades away, and which one to pick.
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WHAT'S INSIDE
- All 10 on a one-page cheat sheet: keyword vs vector, exact vs approximate
- How each one works, its tuning knobs, and a one-line interview answer
- Which one to use, starting from your constraint
- Hybrid search: BM25 + HNSW fused with RRF, in 7 lines of Python
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