A database built to store and search vectors.
A vector database is like a lunchroom seating chart for ideas. Pizza sits near burgers, not near math homework.
It finds meaning matches fast for RAG. You also see it in recommendation feeds and smart search.
Embedding
A vector database stores and searches the vectors made by Embedding.
RAG
RAG uses a vector database to pull useful facts from a knowledge base.
API
An API connects vector database search to business apps.