CouchDB is an open-source database management system that uses a document-oriented approach to store data. It allows users to save data in JSON format, making it easy to work with and flexible for various applications. CouchDB is designed for reliability and scalability, enabling it to handle large amounts of data across distributed systems. One of the key features of CouchDB is its ability to replicate data across multiple servers, ensuring that information is always available and up-to-date. It also provides a RESTful HTTP API, allowing developers to interact with the database using standard web protocols, which simplifies integration with other applications.