Having full root-level access means that you'll be able to access and change any kind of file on a selected server, including all of the system files, and to change system settings or install server-side software that may be needed by specific scripts and even offline apps to function effectively. A server is accessed at the root level via a root user, who has full privileges to do all the aforementioned tasks. Your root user can also create various other users. For safety reasons, you're advised to have a different account for daily tasks and to use the root account only if you actually need to perform some task on the hosting server. The root-level access attribute offers you full control of your server from any location, given that you know the user credentials.