Unlike some years ago when Internet sites were almost exclusively static, the standard these days is to have a feature-rich, dynamic site. Not everybody can build such a web site completely from scratch though, therefore the handiest solution to have a dynamic website is to use a script application. A lot of web hosting companies offer script installers that you can use to add this kind of an app for any of your domain or subdomains, so you'll not have to install anything manually. The advantage of using an installer tool is the fact that the scripts are ready to use within a couple of minutes and the copy which will be installed is already with the settings necessary for it to run correctly on the specific hosting web server, so you'll not need to adjust any script or account settings. That way you can easily create one with simply a couple of clicks even when you have never had an Internet site before.