PHP
PHP (a recursive acronym for PHP: Hypertext Preprocessor) is a server-side HTML embedded scripting language, used to create dynamic Web pages. A dynamic Web page is a page that can interact with the user viewing it, so that on each page the visitor can see specially customized information. PHP is open source and freely available for (primarily) use on Linux (UNIX) Web servers. It is also a great alternative to Microsoft's Active Server Pages (ASP) technology.