DBMS Vs. RDBMS: Some viewpoints taken from internet

In DBMS tables are not related. In RDBMS tables are related In DBMS only one user can access the same database at the same time. In RDBMS many users simultaneously access the same database RDBMS is more secure than DBMS In DBMS store and retrieve small amount of Data In RDBMS store and retrieve large amount of Data.

The database which follows Codd's atleast 6 rules is called as RDBMS.