Having full root-level access means that you will be able to access and update each file on a particular server, including all system files, and to change system settings or install server-side software which may be required by specific scripts and even offline apps in order to function effectively. A server is accessed at the root level through a root user, which has full privileges to do all of the aforementioned tasks. Your root user can also make various other users. For security reasons, you are advised to have a separate account for day-to-day tasks and to use the root account only if you actually need to perform a particular task on your 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.