The function of a database management system (DBMS) is to provide an interface for users to create, manage, and manipulate databases. It serves as a bridge between users and the database, allowing for the storage, retrieval, and organization of data. A DBMS supports various operations, including data entry, queries, and report generation. It ensures data consistency, security, and integrity through transaction management and concurrency control. Popular DBMS examples include MySQL, Oracle, and MongoDB. By facilitating structured data management, DBMSs play a crucial role in application development and data analysis.