Unlike some years ago when Internet sites were almost exclusively static, the standard these days is to have a feature-rich, dynamic site. Not many people can create this sort of site completely from scratch though, hence the most convenient solution to have a dynamic site is to use a script application. Lots of hosting providers offer script installers which can be used to add this sort of an app for each of your domain name or subdomains, so you'll not have to add anything manually. The advantage of using an installer tool is that the scripts are ready to use in just a few minutes and the copy which will be set up is already with the settings needed for it to run the way it should on the specific hosting server, so you will not need to alter any script or account settings. In this way you can easily create one with just a couple of mouse clicks even though you may have never had a site before.