Unlike some years ago when sites were almost exclusively static, the standard today is to have a feature-rich, dynamic web site. Not everybody can build this kind of web site from scratch though, hence the most convenient solution to have a dynamic site is to use a script application. Many hosting service providers offer script installers that you can use to add such an application for any of your domain name or subdomains, so you will not have to set up anything manually. The key advantage of using an installer tool is that the scripts are ready to use in a couple of minutes and the copy that'll 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 alter any script or account settings. This way you can quickly build one with just a few mouse clicks even though you may have never had a site before.