Having full root-level access signifies that you'll be able to access and update each file on a selected server, which includes all of the system files, and to change system settings or install server-side software that may be needed by specific scripts and even offline applications to work properly. A server is accessed at the root level through a root user, who has full privileges to perform all the aforementioned things. Your root user can also make other users. For safety reasons, you are advised to have one more account for daily tasks and to use the root account only if you actually need to do a task on the website hosting server. The root-level access function gives you full control over your server from any location, as long as you have the user credentials.
