PHP is an open source server-side web programming language used by millions of websites. PHP is often used to transfer data into and out of a database to produce dynamic websites. PHP web applications processes data requested from a database and display it to the end user and/or capture data entered by a user and insert it into a database to be stored for use later.

PHP is an HTML embedded programming language, meaning that it can be written directly into HTML code as well as generate and write HTML code by printing or echoing HTML.

Rasmus Lerdorf originally developed PHP in 1995 which he called "Personal Home Page tools." It was later renamed PHP: Hypertext Processor (which is a recursive acronym).