Having full root-level access signifies that you will be able to access and modify any file on a selected server, in addition to all the system files, and to change system settings or install server-side software which may be necessary for specific scripts and even offline applications to function properly. A server is accessed at the root level through a root user, which has full privileges to do all of the abovementioned things. The root user may also make 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 some task on your server. The root-level access function provides you with full control of your server from any location, given that you have the user credentials.