Having full root-level access signifies that you can access and change any file on a particular server, which includes all system files, and to change system settings or set up server-side software which may be needed by specific scripts and even offline apps to function efficiently. A server is accessed at the root level via a root user, who has full privileges to perform all the abovementioned tasks. Your root user can also make other users. For security reasons, you're advised to have another 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 offers you full control over your server from almost any location, as long as you know the user credentials.