""MySQL"" is a free and open-source relational database management system (RDMS) project. The project's source code is available under terms of the GNU General Public License (GPL), but can also be licensed under a proprietary agreement.

webERP uses the ""InnoDB"" storage engine for ""MySQL"", relying on ""InnoDB's"" transaction support for reliability and integrity.

For more information on ""MySQL"", you may find this Wikipedia article of interest - [[http://en.wikipedia.org/wiki/MySQL#History]].