In database management, the acronym RDBMS stands for Relational Database Management System. It is a type of database management system that organizes data into structured formats using tables with rows and columns. RDBMSs allow for the creation, management, and querying of data through structured query language (SQL), ensuring data integrity and enforcing relationships among data entities. The relational model simplifies complex data structures and enables efficient data manipulation, making RDBMSs widely used in various applications ranging from business operations to web services.