What is RDBMS?

RDBMS stands for Relational Database Management System. RDBMS data is structured in database tables, fields and records. 
RDBMS store the data into collection of tables, which might be related by common columns. Most RDBMS use SQL as database query language.

Edgar Codd introduced the relational database model. Many modern DBMS do not conform to the Codd’s definition of a RDBMS, but nonetheless they are still considered to be RDBMS.

The most popular RDBMS are MS SQL Server, DB2, Oracle and MySQL.

Relational databases have often replaced legacy hierarchical databases and network databases because they are easier to understand and use. However, relational databases have been challenged by object databases, which were introduced in an attempt to address the object-relational impedance mismatch in relational database, and XML databases.

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