Unlike some years back when Internet sites were almost exclusively static, the standard today is to have a feature-rich, dynamic site. Few people can build this type of web site completely from scratch though, so the simplest solution to have a dynamic website is to use a script app. A lot of web hosting companies offer script installers which can be used to add this sort of an application for each of your domain or subdomains, so you will not have to install anything manually. The key advantage of using an installer tool is the fact that the scripts are ready to use within a couple of minutes and the copy that'll be installed is already with the settings needed for it to run efficiently on the particular hosting web server, so you'll not need to modify any script or account settings. In this way you can quickly build one with just a couple of mouse clicks even when you have never had a site before.