What is the difference between including a file in PHP and using jQuery to load a file?

When including a file in PHP, the file is loaded and executed on the server-side before the page is sent to the client's browser. This means that the contents of the included file are merged with the rest of the PHP code and processed before the page is displayed. On the other hand, using jQuery to load a file involves making an asynchronous request to the server from the client-side, which allows the file to be loaded after the page has already been displayed. This can be useful for dynamically loading content without refreshing the entire page. PHP code snippet:

<?php
include 'file.php';
?>