A database is an organized collection of data.
Database handlers create database in such a way that only one set of software program provide access of data to all the users.
The main purpose of database is to operate large amount of information by storing, retrieving and managing.
There are many dynamic websites on the world wide web now a days which are handled through databases.
There are many database available like MySQL, Sybase, Oracle, Mango DB, Informix, Postgre, SQL Server etc.
SQL or Structured Query Language is used to perform operation on the data stored in a database. SQL depends on relational algebra and tuple relational calculus.