Unlike some years back when web sites were almost exclusively static, the standard today is to have a feature-rich, dynamic site. Few people can build such a web site completely from scratch though, so the most convenient solution to have a dynamic site is to use a script app. A lot of website hosting service 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 install anything manually. The advantage of using an installer tool would be that the scripts are available to use in just a couple of minutes and the copy that'll be set up is already with the settings required for it to run correctly on the specific hosting server, so you will not need to adjust any script or account settings. This way you can easily build one with simply a couple of mouse clicks even if you have never had an Internet site before.