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