MySQL Community Server is a cross-platform relational SQL database server. MySQL is a multi-threaded, multi-user SQL database management system using a modular engine architecture. It is fast and rock-solid and one of the most widely used SQL engine. Both the MySQL server software itself and the client libraries are distributed under a dual-licensing format. MySQL Server is available as free software under the GNU General Public License (GPL), but the MySQL Enterprise subscription is also offering a traditional proprietary licensing arrangements for cases where the intended use is incompatible with the GPL. MySQL is a key element of the LAMP (Linux, Apache, MySQL, PHP / Perl / Python) open source software architecture for professionnals.