Question

what is an DBMS and RDBMS.​

Answer 1

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DBMS represents a Database Management System. It is used to create/update/delete and maintain a database and it provides controlled access to data. 

RDBMS, Relational Database Management System, is an enhanced version of DBMS.

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Answer 2

Answer:

Database Management System (DBMS) is software designed to store, retrieve, define, and manage data in a database.

A relational database management system (RDBMS or just RDB) is a common type of database that stores data in tables, so it can be used in relation to other stored datasets. ... The data is often stored in many tables, also called 'relations'. These tables are divided into rows, also called records and columns