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