PHP explained
PHP (Hypertext Preprocessor) is a language used to make dynamic web pages. PHP is usually written inside an HTML page but is capable of much more than HTML.
When a user requests an HTML page, the information is sent directly to them. With PHP however, the information is processed by a server and then sent to the user. This processing allows web designers to create dynamic content by accessing databases, reading or writing files, creating images etc. The output of the PHP is then loaded into the user's browser.
Technologies such as blogs or even simple 'contact us' pages would be impossible without PHP.

