Having full root-level access signifies that you can access and modify every file on a particular server, in addition to all the system files, and to change system settings or set up server-side software which may be needed by certain scripts and even offline applications to work effectively. A server is accessed at the root level through a root user, which has full privileges to do all the abovementioned tasks. Your root user can also create other users. For safety 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 specific task on the hosting server. The root-level access feature gives you full control of your server from any location, provided that you know the user credentials.