PHP is a Hypertext Preprocessor often used in web development to create dynamic web pages. PHP is based on a general purpose scripting language, which can be embedded in normal HTML.

PHP pages are normally stored on the web server or web host with the extension php (i.e. index.php), which allows the web server to recognise these web pages, and process the scripts on them to create pure HTML pages. The difference with PHP and Javascript is that PHP scripts are executed on the web server, not in your web browser, which enables them to store and retrieve data from a database on the web host.

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