PHP

PHP is a programming language that is used for developing dynamic web pages.

Defination- PHP is a embedded server site scripting language originally designed for web development to produce dynamic web pages.

Embedded means we can write PHP code inside HTML.

Server-side means it executes on server. 

PHP stands for PHP: Hypertext Preprocessor. 

PHP is available free of cost under the PHP license.

You can download it from php.net