What is the difference between using include() and frames for loading content on a webpage in PHP?

The main difference between using include() and frames for loading content on a webpage in PHP is that include() allows you to dynamically include content from other PHP files within the same page, while frames involve loading separate HTML documents into separate frames within the same webpage. Include() is more flexible and allows for better integration of content, while frames can lead to issues with accessibility, SEO, and overall user experience.

<?php
include('header.php');
include('content.php');
include('footer.php');
?>