MySQL is a free open source relational database management system (RDBMS). It is used to store, organise and retrieve data in a structured way using tables and fields similar to a spreadsheet.

MySQL is popular because it is easy to use and can process large amounts of data efficiently. It is often used in web applications such as content management systems (CMS) and online shops and can be used in combination with programming languages such as PHP, Python and Java to create dynamic and interactive websites and applications.

MySQL is available for a wide range of operating systems, including Windows, macOS and Linux, and is supported by a large and active community of users and developers.