All script applications including forums or e-stores save their info in a database - a group of cells and tables containing the Internet site data including items, prices, comments, etc. Whenever you open a specific page, the script connects to the database and retrieves the specified info, then displays it. The intermediary software that connects the script and the database is referred to as a database management system and amongst the most popular ones is MySQL. The latter is commonly used because it can run on different platforms (Linux, UNIX, Windows) and with a number of scripting languages (Python, Perl, PHP, Java), not mentioning its wonderful functionality even with big databases. Numerous famous platforms such as Joomla or WordPress employ MySQL databases to save their content.