Unlike some years back when websites were almost exclusively static, the standard these days is to have a feature-rich, dynamic website. Not everybody can build this type of site from scratch though, therefore the most convenient solution to have a dynamic site is to use a script app. A lot of website hosting providers offer script installers which can be used to add this type of an app for any of your domain or subdomains, so you'll not need to install anything manually. The best thing about using an installer tool is that the scripts are ready to use in just a couple of minutes and the copy which will be installed is already with the settings needed for it to run the way it should on the particular hosting server, so you will not need to change any script or account settings. That way you can quickly build one with only a few clicks even though you may have never had a website before.