Unlike some years back when Internet sites were almost exclusively static, the standard currently is to have a feature-rich, dynamic site. Not everybody can create this sort of web site from scratch though, hence the most convenient solution to have a dynamic site is to use a script application. A lot of web hosting providers offer script installers which you can use to add this kind of an app for each of your domain name or subdomains, so you'll not need to add anything manually. The key advantage of using an installer tool would be that the scripts are available to use in a couple of minutes and the copy that will be installed is already with the settings needed for it to run properly on the particular hosting web server, so you will not have to modify any script or account settings. In this way you can quickly create one with simply a few clicks even when you have never had a website before.