PHP stands for Hypertext Pre-Processor. PHP is a scripting language used to develop static and dynamic webpages and web applications. PHP is an Interpreted language, hence it doesn't need a compiler. To run and execute PHP code, we need a Web server on which PHP must be installed.PHP is a server-side scripting language, which means that PHP is executed on the server and the result is sent to the browser in plain HTML. PHP is open-source and free.