Oracle

Organizations can store data on various media and in different formats, such as a hard-copy document in a filing cabinet or data stored in electronic spreadsheets or in databases.

A database is an organized collection of information.

To manage databases, you need database management systems (DBMS). A DBMS is a program that

stores, retrieves, and modifies data in the database on request. There are four main types of databases:

hierarchical, network, relational, and more recently object relational(ORDBMS).

There are lots of RDBMS available in the market,Out of them Oracle is One Database.