Unlike some years ago when web sites were almost exclusively static, the standard these days is to have a feature-rich, dynamic website. Few people can build this kind of website from scratch though, hence the handiest solution to have a dynamic website is to use a script app. A lot of web hosting companies offer script installers which you can use to add such an application for each of your domain name or subdomains, so you'll not have to install anything manually. The best thing about 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 installed is already with the settings required for it to run adequately on the particular hosting web server, so you will not have to change any script or account settings. In this way you can quickly build one with just a few mouse clicks even though you may have never had a website before.