PHP stands for PHP Hypertext Preprocessor. PHP, as stated by the official php website (www.php.net), is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML.

PHP is server side scripting language. This means that all the executiion of code takes place at the server itself. You never see the php code in browser. All the php code is executed at the server and only the results are passed to the browser to display it accordingly. That is why html is imminently used with php.

Remember, HTML is a formatting language that gives "face" to your website whereas php is a scripting language that is generally used either for calculations or for querying the database.

 If you do not plan to use it for either purpose, PHP is not for you.