Glossary:

PHP

PHP the PHP Hypertext Preprocessor is a server-side scripting language that was created for web development.  PHP runs on a web server and processes PHP code. 

PHP code is generally written as files with a .php .phtml .php5 file extension which can include HTML tags.  PHP creates dynamic web page content from the PHP code, databases and forms and is usually coded to generate HTML which is then sent to a users web browser.

PHP is free software and is installed on over 20 million websites.  It is cross-platform and can be deployed on most web server operating systems.  PHP has been used to create various web based frameworks for rapid application development (RAD) and Content Management Systems (CMS).