MySQL is a Relational SQL database management system , and it is open source software.

Relational database means that all the data is stored into different tables 

and relations are established using primary keys or other keys known as foreign keys.

A Relational DataBase Management System (RDBMS) is a software that:

  • Enables you to implement a database with tables, columns, and indexes.

  • Guarantees the Referential Integrity between rows of various tables.

  • Updates the indexes automatically.

  • Interprets an SQL query and combines information from various tables.


ref : http://www.tutorialspoint.com/mysql/mysql-introduction.htm

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