What is the difference between using include in PHP and frames in HTML for embedding content?

When embedding content in PHP, using include allows you to pull in external PHP files and incorporate their content directly into your current file. This is a server-side operation that includes the content during runtime. On the other hand, using frames in HTML involves dividing the browser window into multiple frames, each of which can display a separate HTML document. This is a client-side operation that loads and displays the content simultaneously.

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