A database administrator (DBA) plays a crucial role in managing databases by ensuring they are secure, functional, and optimized. Their responsibilities include installation, configuration, and maintenance of database systems, as well as performance tuning and optimization. DBAs are also tasked with implementing security measures to protect data integrity, performing regular backups, and establishing recovery plans. Additionally, they handle user access control and monitor database performance to ensure efficient operation. They serve as a vital link between IT infrastructure and user needs, supporting data-driven decision-making within an organization.