MySQL is a relational database management system.
MySQL is a feature-rich, general-purpose database server which can be installed quite easily. It is nearly ubiquitously available on shared hosting platforms, and it is a very popular choice for storing data in web applications.
Since the product was acquired by Oracle in 2010, there have been concerns about the future development of the open source project. MariaDB, a project led by the original developers of MySQL, is becoming popular as a drop-in replacement, which also offers technological improvements.