What is the definition of a database management system?

A database management system (DBMS), sometimes just called a database manager, is a program that lets one or more computer users create and access data in a database. The DBMS manages user requests (and requests from other programs) so that users and other programs are free from having to understand where the data is physically located on storage media. the DBMS ensures the integrity of the data and security od the data.

A database management system is is a set of computer programs that controls the creation, maintenance, and the use of the database with computer. You can read more at www.webopedia.com/database_management_system_DBMS.html