What is the difference between using an iframe and PHP to display content on a website?

Using an iframe to display content on a website involves embedding an external webpage within your site, while using PHP allows you to dynamically generate content within your own webpage. Iframes can be useful for displaying content from another source, but they may not always be responsive or customizable. On the other hand, using PHP gives you more control over the content and allows for dynamic updates based on user input or database queries.

<?php
// PHP code to display content on a website
echo "Hello, world!";
?>