The main role of a database management system (DBMS) is to provide a structured way to create, retrieve, and manage data in a database. A DBMS acts as an interface between the user and the database, allowing users to perform operations such as data entry, querying, and maintenance. It ensures data integrity and security while facilitating simultaneous access by multiple users. Additionally, a DBMS provides tools for data backup, recovery, and transaction management, ensuring that data remains consistent and accurate throughout its lifecycle. Examples of popular DBMS include MySQL, PostgreSQL, and Oracle.