Having full root-level access signifies that you can access and update any kind of file on a specific server, which includes all of the system files, and to change system settings or set up server-side software that may be necessary for certain scripts and even offline applications to function properly. A server is accessed at the root level through a root user, who has full privileges to perform any of the abovementioned tasks. The root user can also generate various other users. For safety reasons, you're advised to have another account for routine tasks and to use the root account only if you actually need to do a particular task on the hosting server. The root-level access function provides you with full control of your server from any location, as long as you have the user credentials.
