Having full root-level access signifies that you can access and change any file on a particular server, which includes all of the system files, and to change system settings or install server-side software which may be required by certain scripts and even offline apps to work properly. 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 create other users. For safety reasons, you are advised to have a different account for routine 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 offers you full control of your server from almost any location, given that you know the user credentials.