Unlike some years ago when sites were almost exclusively static, the standard these days is to have a feature-rich, dynamic Internet site. Few people can create this type of website from scratch though, therefore the handiest solution to have a dynamic website is to use a script application. Many web hosting providers offer script installers which you can use to add such an application for each of your domain or subdomains, so you'll not need to set up anything manually. The main advantage of using an installer tool is the fact that the scripts are ready to use in a couple of minutes and the copy which will be installed is already with the settings needed for it to run the way it should on the specific hosting server, so you'll not have to modify any script or account settings. That way you can quickly build one with just a couple of clicks even if you have never had a site before.