What is MySQL?
MySQL is the database system that you are going to find on almost every non-windows based hosting system in the world as the default or only database system. It is installed at more than six million installations. Because of the installed base it is the de facto industry standard. Almost every script written works with one or more versions of MySQL.
A database is a structured collection of data. MySQL allows you to quickly import, export, access and edit the data using PHPMyAdmin which is located in your control panel.
There are many great tutorials on the web for MySQL and there is no point in my duplicating the content of them here in this explanation.