Unlike some years ago when websites were almost exclusively static, the standard today is to have a feature-rich, dynamic web site. Not everybody can create such a website completely from scratch though, so the simplest solution to have a dynamic website is to use a script application. A lot of hosting companies offer script installers that you can use to add this type of an application for each of your domain or subdomains, so you will not need to install anything manually. The main benefit of using an installer tool would be that the scripts are available to use in a few minutes and the copy that'll be set up is already with the settings needed for it to run the way it should on the particular hosting web server, so you'll not need to adjust any script or account settings. This way you can easily create one with only a few clicks even though you may have never had a website before.