Having full root-level access means that you will be able to access and customize any file on a particular server, which includes all system files, and to change system settings or install server-side software which may be necessary for 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 perform all of the aforementioned tasks. The root user may also make various other users. For security reasons, you're advised to have a separate account for daily tasks and to use the root account only if you actually need to perform a particular task on the server. The root-level access attribute provides you with full control over your server from any kind of location, given that you know the user credentials.