A relational database management system (RDBMS) is a software that allows users to create, manage, and interact with relational databases. In an RDBMS, data is organized into tables, which consist of rows and columns, with each table representing a specific entity, such as customers or orders. These tables can be linked or related to one another through keys, which helps maintain data integrity and allows complex queries to be performed across multiple tables. The system uses Structured Query Language (SQL) as the standard interface for querying, updating, and managing the data. RDBMSs are widely used in applications that require structured data management, offering features like data security, backup, recovery, and transaction management to ensure reliable and efficient data handling.