Having full root-level access means that you can access and update any file on a selected server, including all of the system files, and to change system settings or set up server-side software which may be necessary for specific scripts and even offline applications in order to work efficiently. A server is accessed at the root level through a root user, which has full privileges to perform all of the abovementioned tasks. The root user may also create various other users. For safety reasons, you're 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 specific task on the website hosting server. The root-level access attribute gives you full control over your server from almost any location, given that you know the user credentials.