What is MySQL?
MySQL is a relational database management system. It is a Open Source SQL database provided by MySQL AB. MySQL is very fast, reliable, and easy to use. It also has a very practical set of features developed in very close cooperation with our users. MySQL was originally developed to handle very large databases much faster than existing solutions and has been successfully used in highly demanding production environments for several years. Though under constant development, MySQL today offers a rich and very useful set of functions. The connectivity, speed, and security make MySQL highly suited for accessing databases on the Internet.
http://www.mysql.com