MySQL is a true multi-user, multi-threaded SQL (Structured Query Language) database server. MySQL is a client/server implementation that consists of a server daemon mysqld and many different client programs/libraries. For more information on MySQL, please refer to our MySQL FAQ, our MySQL Support Notes, and the official MySQL web site.
"The MySQL database has become the world's most popular open source database because of its consistent fast performance, high reliability and ease of use. It's used in more than 10 million installations ranging from large corporations to specialized embedded applications on every continent in the world. (Yes, even Antarctica!)
Not only is MySQL the world's most popular open source database, it's also become the database of choice for a new generation of applications built on the LAMP stack (Linux, Apache, MySQL, PHP / Perl / Python.) MySQL runs on more than 20 platforms including Linux, Windows, OS/X, HP-UX, AIX, Netware, giving you the kind of flexibility that puts you in control." Source: mysql.com