Tutorials Point, Simply Easy Learning MySQL Tutorial MySQL is the most popular Open Source Relational SQL database management system. MySQL is one of the best RDBMS being used for developing web based software applications. This tutorial gives an initial push to start you with MySQL. For more detail kindly check What is Database? A database is a separate application that stores a collection of data. Each database has one or more distinct APIs for creating, accessing, managing, searching, and replicating the data it holds. Other kinds of data stores can be used, such as files on the file system or large hash.