FrontPage Extensions are a set of system files and folders needed by websites designed with Microsoft FrontPage so as to perform properly. Without them, you may still use the app to build websites and upload your content on the web server, yet the sites will have restricted features, thus the user experience will not be the same. Another advantage of using a website hosting service with FrontPage Extensions available is that you can publish your web pages directly on the server without the need for any third-party software as long as you enter your account FTP details in FrontPage. This feature will make it very easy to start and maintain your web presence even if you don't have any previous knowledge, as you'll be able to update the website later on just as easily.