PHP, which is an abbreviation for PHP: Hypertext Preprocessor, is among the most popular scripting languages available out there. Any site or application written in PHP will run on a given server as long as a PHP module is enabled, which makes the language absolutely universal and it is barely surprising that there are a couple of million servers that support it and hundreds of millions of PHP-driven websites running on them. PHP is preferred over HTML because it allows you to build a dynamic serving website with plenty of different options. A PHP-based community website, for example, will show different content to each visitor even though the URL will be the same. In comparison, HTML websites are static and the content on the pages can be modified only manually. Just like any other software program, PHP has several versions and the version that was used whilst setting up a particular website must be set up on the server in order for the site to run properly.