Unlike some years ago when sites were almost exclusively static, the standard nowadays is to have a feature-rich, dynamic website. Few people can build such a web site from scratch though, hence the most convenient solution to have a dynamic website is to use a script application. Many hosting companies offer script installers you can use to add such an app for each of your domain or subdomains, so you will not have to install anything manually. The main advantage of using an installer tool is that the scripts are available to use in a couple of 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 adjust any script or account settings. This way you can effortlessly build one with only a few mouse clicks even when you have never had a website before.