（ ） is a software package designed to store. retrieve, queryand manage data.User interfaces (U1s) allows data to be created, read, updated and deleted by authorized entities. Thesystem users include database administrators (DBAs), application programmers and end users.Most of the time,（ ） are the only ones to directly interact with a system.They use (（ ）to deal with database schemas and descriptions, of how the datashould reside in the database.Thev use （ ） to deal with datamanipulation which includes most common SOL statementssuch as SELECT,INSERT,UPDATE,DELETE,etc..They alsofocus on managing andmaintaining the （ ）of the database system: prevent unauthorized access to the data.