A Relational Database Management System (RDMS) is a software system designed to store and retrieve data from a database. It is a system that enables data to be stored in an organized, logical, and secure manner. It is used to store and manage data in a database, which is a collection of information organized in such a way that it can be easily accessed, managed, and updated.

The main purpose of a RDMS is to provide a platform for database management. It is used to create, update, delete, and access data in a database. A RDMS contains tables, which are collections of data that can be related to each other in order to store and retrieve information. It also contains views, which are virtual tables that display data from multiple tables.

A RDMS allows users to define database structure, manipulate data, query data, develop database applications, and secure the database. It also provides a user–friendly interface for managing the database. A RDMS provides the ability to store data in a relational way, which is a logical and efficient way to store data.

The most popular RDMS are Oracle, Microsoft SQL Server, IBM DB2, MySQL, and PostgreSQL. Each of these RDMS have their own features and advantages. For example, Oracle is the most widely used RDMS in the world and provides a wide range of features, while MySQL is an open–source RDMS that is easy to use and is popular amongst web developers.

When choosing a RDMS, it is important to consider the size and complexity of the database, the type of data being stored, and the performance requirements. It is also important to consider the cost, support, security, and scalability of the RDMS.

In conclusion, a RDMS is an essential tool for any organization that needs to store and manage data in an organized, logical, and secure manner. It provides the ability to store data in a relational way, which is a logical and efficient way to store data. A RDMS also provides a user–friendly interface for managing the database, as well as a wide range of features and benefits.