Having full root-level access signifies that you'll be able to access and change any kind of file on a specific server, including all of the system files, and to change system settings or install server-side software that may be necessary for specific scripts and even offline applications in order to work appropriately. A server is accessed at the root level with a root user, who has full privileges to perform all the abovementioned things. Your root user can also generate various other users. For safety reasons, you are advised to have another account for everyday tasks and to use the root account only if you actually need to perform a specific task on the website hosting server. The root-level access feature offers you full control over your server from almost any location, given that you have the user credentials.
