What is Relational DB?

A Relational Database (RDB) is a type of database that organizes data into one or more tables (or "relations") of columns and rows, with a unique key identifying each row. Rows are also commonly referred to as records or tuples. Columns contain attributes describing each data entry. Relationships are created by using foreign keys, which reference the primary key of another table, thus allowing data to be linked across tables. RDBs are widely used for managing structured data in various applications, from small business to large enterprise systems, because they provide data integrity, consistency, and efficient data retrieval using SQL (Structured Query Language).