All script applications including forums or virtual stores save their information inside a database - a set of cells and tables containing all the Internet site data like items, prices, comments, and so on. Every time you open a certain page, the script connects to the database and retrieves the needed data, then shows it. The mid-level software which connects the script and the database is called a database management system and amongst the most well-known ones is MySQL. The latter is widely used as it can run on a variety of platforms (Linux, Windows, UNIX) and with a number of scripting languages (PHP, Perl, Python, Java), not mentioning its amazing performance even with huge databases. Lots of famous platforms such as Joomla™ or WordPress work with MySQL databases to save their content.