Having full root-level access means that you'll be able to access and update any file on a particular server, in addition to all system files, and to change system settings or install server-side software which may be necessary for specific scripts and even offline applications to work effectively. A server is accessed at the root level with a root user, which has full privileges to do all of the aforementioned tasks. Your root user can also generate other users. For safety reasons, you are advised to have a separate account for everyday tasks and to use the root account only if you actually need to do a specific task on your server. The root-level access attribute gives you full control over your server from any kind of location, given that you know the user credentials.