Having full root-level access means that you'll be able to access and modify any kind of file on a selected server, in addition to all the system files, and to change system settings or install server-side software which may be necessary for specific scripts and even offline apps to function properly. A server is accessed at the root level through a root user, who has full privileges to do all of the aforementioned tasks. Your root user may also generate other users. For security reasons, you're advised to have a different account for day-to-day 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 existing location, provided that you have the user credentials.