Add-ons are elements that you can include on your web site to improve interaction with your visitors and make your site more informative and appealing. Easy-to-use add-ons such as guestbooks, counters, and maps are available to all Web Hosting users. If you're an advanced user, we also recommend our powerful advanced add-ons, which rely on PHP, Perl, and MySQL to provide even more interactivity and customization.