MySQL is a relational database management system that stores data in tables and is queried with SQL. It is widely used as the data store behind web applications, content management systems and business software. Oracle offers it in several forms: the Community Edition, which you can download and run on your own servers, the commercial Enterprise Edition with additional management tools and support, an embedded edition for OEMs and ISVs, and MySQL HeatWave, a managed cloud service. Related tools include MySQL Shell, Router and Workbench.
MySQL was created by the Swedish company MySQL AB and has been owned by Oracle Corporation, a US company, since Oracle's acquisition of Sun Microsystems was completed in 2010. The code is available under the GNU GPL version 2 or under a proprietary licence. Self-hosting the Community Edition lets you decide where data is stored and who operates it, while development direction and the commercial editions remain with a US parent company. Community forks such as MariaDB and Percona Server exist and aim to stay compatible with MySQL.