SQL stands for Structured Query Language. It is a special-purpose programming language designed for managing data held in a relational database management systems (RDBMS). Originally based upon relational algebra and tuple relational calculus, SQL consists of a data definition language and a data manipulation language. The scope of SQL includes data insert, query, update and delete, schema creation and modification, and data access control.
SQL programs are put in place by businesses and other organisations as a way to access and manipulate the information and data that is stored in their databases, as well as for creating and altering new tables.