Unlike some years back when web sites were almost exclusively static, the standard currently is to have a feature-rich, dynamic site. Not everybody can create such a web site from scratch though, so the handiest solution to have a dynamic site is to use a script application. Many website hosting service providers offer script installers that can be used to add such an application for any of your domain name or subdomains, so you'll not have to install anything manually. The key advantage of using an installer tool would be that the scripts are ready to use in a few minutes and the copy that will be installed is already with the settings required for it to run the way it should on the specific hosting web server, so you'll not need to modify any script or account settings. That way you can quickly build one with only a few mouse clicks even when you have never had a website before.