Originally established back in 1994, PHP was the first programming language created specifically for the web. It previously stood for Personal Home Page due to its core use on early web pages, but it is now known to be a recursive acronym for Hypertext Pre-Processor.
Today, PHP is one of the most popular server-side scripting languages. It can be used to enhance web pages by creating features that HTML alone cannot, such as login functionality, forums, surveys, and photo galleries. It runs effectively on almost all servers and is free to download.
As an example of its extensive use, the popular website/blogging platform WordPress is written using PHP. In fact, over 80% of sites on the web use PHP, including large sites such as Facebook, MailChimp, Wikipedia, Tumblr and Yahoo.