Having full root-level access signifies that you'll be able to access and update any kind of file on a particular server, in addition to all the system files, and to change system settings or install server-side software that may be required by certain scripts and even offline applications to function efficiently. A server is accessed at the root level via a root user, who has full privileges to do all the aforementioned things. Your root user can also create various other users. For security reasons, you're advised to have another account for routine tasks and to use the root account only if you actually need to perform a particular task on the hosting server. The root-level access attribute provides you with full control of your server from any kind of location, provided that you have the user credentials.