PHP is a server-side scripting language designed specifically for the web. Within an HTML page, you can embed PHP code that will be executed each time the page is visited. Your PHP code is interpreted at the web server and generates HTML or other output that the visitor will see.A PHP file is just an HTML file saved using a .php extension instead of a .html or .htm extension, which tells the server to looking the page for code.PHP is a language that can be used to create dynamic web pages, In fact that is the whole point of PHP.Static Vs Dynamic web pagesA static web page never changes, unless a person specifically edit the page.A dynamic web page can be different every time it is viewed by a browser because the server edits the page prior to sending it to the browser accordingly to what instructions the programmer has coded into that specific page.PHP was introduced in 1994. As of November 2007, it was installed on more than 21 million domains worldwide, and this number is growing rapidly. You can see the current number at http://www.php.net/usage.phpPHP is an Open Source project. PHP originally stood for Personal Home Page and now stands for PHP Hypertext Preprocessor.A Simple PHP Script123<?phpecho “Hello Web!”; ?>Output: Hello Web! t?