Having full root-level access signifies that you'll be able to access and customize each file on a selected server, in addition to all system files, and to change system settings or set up server-side software that may be needed by specific scripts and even offline apps in order to work efficiently. A server is accessed at the root level through a root user, which has full privileges to do any of the aforementioned things. The root user may also make other users. For security reasons, you are advised to have a different account for daily tasks and to use the root account only if you actually need to perform some task on the server. The root-level access function will give you full control of your server from any existing location, as long as you know the user credentials.