MySQL is a multithreaded, multi-user, SQL Database Management System. It is often accessed and managed through PHP-driven content management systems. (MediaWiki, the wiki engine for Wikiversity is an example of a system that uses MySQL.)
The open source MySQL was owned and sponsored by a single for-profit firm, the Swedish company MySQL AB, which holds the copyright to most of the codebase. Both the MySQL server software itself and the client libraries are distributed under a dual-licensing format. (MediaWiki deploys MySQL under the GNU General Public License).
mysql> show plugins;
mysql> show processlist;
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