Unlike some years back when web sites were almost exclusively static, the standard these days is to have a feature-rich, dynamic site. Not everybody can create this sort of site from scratch though, therefore the most convenient solution to have a dynamic website is to use a script application. Many web hosting providers offer script installers that you can use to add such an application for each of your domain or subdomains, so you will not have to set up anything manually. The main advantage of using an installer tool is that the scripts are ready to use within a few minutes and the copy which will be installed is already with the settings necessary for it to run efficiently on the specific hosting web server, so you will not have to alter any script or account settings. In this way you can easily build one with simply a couple of clicks even if you have never had a site before.