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BM25

A classical keyword-based ranking algorithm. Scores documents by how often query terms appear, weighted by rarity.

In depth

BM25 remains the baseline for keyword search because it handles exact matches (SKUs, part numbers, named products) that vector search can miss. Most modern e-commerce search stacks combine BM25 with vector search; see Hybrid search.

Related glossary entries

Vector search
Searching by semantic meaning using embeddings: numerical representations of text that capture meaning.
Webhook sync
A data-sync pattern where the store pushes events (product saves, translations, order status changes) to the assistant over HTTPS, rather than the assistant polling …
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