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A relational database management system (RDBMS) is a software system used to manage data. It is based on the relational data model developed by Edgar Codd in the 1970s. In an RDBMS, data is organized into tables consisting of rows and columns. Each table has a unique identifier, and relationships between different tables can be established through links based on keys.
An RDBMS provides a standardized language, SQL (Structured Query Language), to query, modify or delete data from the tables. SQL also allows you to define relationships between tables, set access rights, and perform transactions to ensure data consistency and integrity.
An RDBMS is highly scalable and can store, retrieve and manipulate data efficiently. It is used in many applications and industries, including banking, retail, insurance, healthcare, and public administration. Some of the most popular RDBMS systems are Oracle, MySQL, PostgreSQL, and Microsoft SQL Server.