The answer
A data structure that allows fast nearest-neighbor search, avoiding comparing the query against every vector.
What is a Vector Database and Why Do You Need One?
What is a vector index?
More FAQs in What is a Vector Database and Why Do You Need One?
You can. Extensions like pgvector (PostgreSQL) exist, but dedicated vector databases are often more performant at scale.
A mathematical metric measuring the cosine of the angle between two vectors, indicating how close their meanings are.
The length of the vector array. For example, OpenAI's text-embedding-3-small generates vectors of size 1536.
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