RDBMS (Relational Database Management System) is a database management system (DBMS) based on the relational model invented by Edgar F. Codd, of IBM’s San Jose Research Laboratory fame. Most databases in widespread use today are based on his relational database model.
It uses a structure that allows us to identify and access data in relation to another piece of data in the database. Often, data in a relational database organizes data in a structured format, using rows and columns. This makes it easy to locate and access specific values within the database. It is “relational” because the values within each table are related to each other. Tables may also be related to other tables. The relational structure makes it possible to run queries across multiple tables at once.