Berkeley DB is an open-source, high-performance database library that provides developers with a simple way to store and manage data. It is designed for embedded use, meaning it can be integrated directly into applications without the need for a separate database server. This makes it ideal for applications that require fast access to data, such as web applications and mobile apps. The database supports various data storage models, including key-value pairs and relational data. It is known for its reliability, scalability, and flexibility, allowing developers to choose from different programming languages and APIs. Berkeley DB is widely used in industries like finance, telecommunications, and gaming.