What Is the Difference Between DBMS and RDBMS?

The main difference between a database management system, or DBMS, and a relational database management system, RDBMS, is that DBMS applications store data as files, while RDBMS applications store data in tables. DBMS is prone to data redundancy. In a RDBMS, each table has a unique identifier know as a "primary key"; this reduces the instances of data redundancy.