Having full root-level access signifies that you will be able to access and update each file on a selected server, including all system files, and to change system settings or set up server-side software which may be required by certain scripts and even offline apps to work effectively. A server is accessed at the root level with a root user, which has full privileges to perform all the aforementioned tasks. The root user may also make other users. For security reasons, you're advised to have a different account for everyday tasks and to use the root account only if you actually need to perform a particular task on the hosting server. The root-level access function offers you full control of your server from any kind of location, as long as you know the user credentials.