Having full root-level access signifies that you can access and modify any kind of file on a particular server, including all system files, and to change system settings or set up server-side software that may be required by certain scripts and even offline applications to work effectively. A server is accessed at the root level with a root user, which has full privileges to perform all the aforementioned tasks. The root user can also make various other users. For safety reasons, you're advised to have a different account for everyday tasks and to use the root account only if you actually need to perform some task on your website hosting server. The root-level access function offers you full control of your server from any location, given that you have the user credentials.