What is the difference between PHP and HTML in terms of client-side output?

PHP is a server-side scripting language, meaning that it is executed on the server before the HTML is sent to the client's browser. This allows PHP to dynamically generate HTML content based on variables, conditions, and database queries. On the other hand, HTML is a client-side language that is interpreted by the browser directly.

<?php
   echo "Hello, World!";
?>