I believe in IT industry, every person regardless of what his/her position is in an organizational chart, has a role that defines what he/she does. for example, one might be a CTO in a company, but his role is a developer, as his main expertise are about programming. I am a DBA, and I'm very passionate about databases.
A database management system (DBMS) is a computer software application that interacts with the user, other applications, and the database itself to capture and analyze data. A general-purpose DBMS is designed to allow the definition, creation, querying, update, and administration of databases.
Database administrators (DBAs) use specialized software to store and organize data. The role may include Capacity planning, installation, configuration, design of database, migration, performance monitoring, security, troubleshooting, as well as backup and data recovery.
SQL Server is the foundation of Microsoft's data platform, delivering mission-critical performance with in-memory technologies and faster insights on any data, whether on-premises or in the cloud.