MySQL is a popular, open-source relational database management system (RDBMS) that can run on more than 20 different platforms, including Linux, Windows and OS/X. It is often used in conjunction with the PHP: Hypertext Preprocessor (PHP) programming language.
MySQL is often used for collaboratively authored Web sites such as Wikipedia. Some of the other well-known sites built on MySQL relational databases include:
Level of Difficulty
MySQL is easy to learn because it doesn't support advanced some advanced functions such as transactions. It is good for basic relational databases.