A vector database is a type of database that stores and manages high-dimensional data, such as text, images, or audio, by converting it into numerical representations called embeddings. These embeddings are then used to perform efficient searches for similar profiles or sessions based on user interactions or preferences. Vector databases offer a solution for storing and searching these vectors efficiently, with features such as pre-processing, post-processing, caching, query rewriting, concurrency control, and transaction management. They also provide a tradeoff between accuracy and speed, with exact searches being complex but faster, and approximate searches being less accurate but more efficient. Popular vector search algorithms include KNN and ANN, which can be used to optimize search performance and overall system efficiency, ultimately contributing to improved user experience and better application outcomes.