Unlike some years back when web sites were almost exclusively static, the standard these days is to have a feature-rich, dynamic site. Not many people can build this type of 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 web hosting companies offer script installers you can use to add such an app for each of your domain or subdomains, so you'll not have to install anything manually. The advantage of using an installer tool would be that the scripts are ready to use in a few minutes and the copy that'll be installed is already with the settings necessary for it to run properly on the specific hosting server, so you will not have to modify any script or account settings. In this way you can effortlessly create one with simply a few clicks even though you may have never had a website before.