When you have root-level access to a hosting server, it indicates that you will have full control over it. In other words, you'll be able set up any server-side application no matter what the changes that it will make to the software setting on your server, and you'll be able to both access and customize any file, which includes system files, and modify various settings. This can be done by connecting to the server as a root user that has full privileges to do the aforementioned things as well as to make other users, which includes users who also have full privileges. The connection can be established with a web-based graphical interface or a Secure Shell console. For safety reasons, it's recommended that you create one more user for your daily work and employ the root user only when you need to customize the server or to install software that may be required by some script-driven app that you'd like to run.