MySQL is an open-source relational database management system. Its name is a combination of 'My', the name of co-founder Michael Widenius's daughter, and 'SQL', the abbreviation for Structured Query Language. MySQL is a database system used on the web. MySQL is a database system that runs on a server. MySQL is ideal for both small and large applications. MySQL is very fast, reliable, and easy to use. MySQL uses standard SQL. MySQL compiles on a number of platforms. MySQL is free to download and use.