PHP or Hypertext Preprocessor is a server side, HTML embedded scripting language that is used primarily on Linux Web servers to create dynamic Web pages. PHP script is enclosed within special PHP tags. An HTML page that includes a PHP script is typically given a file name suffix of ".php" ".php3," or ".phtml". It is extremely fast and powerful and is very similar in structure to the language C. A great place to start when learning about PHP is http://www.php.net.