Having full root-level access signifies that you can access and modify every file on a particular server, which includes all system files, and to change system settings or set up server-side software which may be necessary for specific scripts and even offline apps in order to function efficiently. A server is accessed at the root level with a root user, who has full privileges to do any of the aforementioned things. The root user can also create various other users. For safety reasons, you are advised to have a different account for day-to-day tasks and to use the root account only if you actually need to do some task on the website hosting server. The root-level access function will provide you with full control of your server from any kind of location, given that you have the user credentials.