Having full root-level access signifies that you will be able to access and modify any file on a specific server, including all system files, and to change system settings or install server-side software that may be required by specific scripts and even offline apps to work effectively. A server is accessed at the root level via a root user, which has full privileges to do any of the abovementioned tasks. The root user can also make other users. For safety reasons, you are advised to have one more account for everyday tasks and to use the root account only if you actually need to do some task on your hosting server. The root-level access attribute gives you full control over your server from any existing location, as long as you know the user credentials.