Having full root-level access signifies that you will be able to 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 that may be necessary for specific scripts and even offline apps in order to work appropriately. A server is accessed at the root level with a root user, who has full privileges to perform any of the abovementioned tasks. The root user can also make various other users. For safety 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 your server. The root-level access attribute provides you with full control of your server from any location, as long as you know the user credentials.
