Having full root-level access signifies that you'll be able to access and customize every file on a selected server, in addition to all system files, and to change system settings or set up server-side software that may be needed by specific scripts and even offline apps in order to function properly. A server is accessed at the root level through a root user, which has full privileges to do any of the abovementioned things. The root user may also create various other users. For security reasons, you are advised to have one more account for everyday tasks and to use the root account only if you actually need to perform a task on the hosting server. The root-level access attribute will provide you with full control of your server from any kind of location, provided that you know the user credentials.