Having full root-level access signifies that you can access and update any kind of file on a particular server, including all of 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 effectively. A server is accessed at the root level through a root user, who has full privileges to do all the aforementioned tasks. Your root user may also make other users. For safety reasons, you are advised to have one more account for everyday 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 function will give you full control over your server from any existing location, given that you know the user credentials.