PHP Hypertext Preprocessor
PHP is a programming language that runs on the web server. It is used to add extra functionality to web pages. As an example, this blog is a WordPress blog and uses PHP and a database make things happen.
PHP is a very powerful programming language which was specifically designed to work with websites. It makes tasks that used to be complicated, like handling forms, really simple.
PHP is an Open Source language. This means that it is not only free to install and use but also it is maintained by a large number of developers for the common good. This means that it cannot be taken away or charged for in the future unlike proprietary labguages.