https://www.cloudflare.com/learning/ai/what-is-vector-database/
https://www.pinecone.io/learn/vector-database/
A vector database is a collection of data stored as mathematical collections. Vector databases make it easier for machine learning models to remember previous inputs, allowing machine learning to power search, recommendations, and text generation use cases.
Each vector in a vector database corresponds to an object or item, whether a word, an image, a video, a movie, a document, or any other piece of data. These vectors are likely to be lengthy and complex, expressing the location of each object along dozens or even hundreds of dimensions.