Library / SDK
Retrieval & Memory
FAISS
1Efficient 2similarity 3search 4over 5dense 6vectors.
the six Ws · specification
W1
Who
Open-source library from Meta AI Research.
W2
What
Indexes and searches dense vectors efficiently.
W3
Where
A C++ and Python library on your infrastructure.
W4
When
When you need fast in-memory vector search.
W5
Why
A battle-tested foundation for retrieval systems.
W6
With
Your embeddings and enough memory.