The superuser on a Linux system is also called root. Anything that can be done on a server can be done by root. However, normal users can only do a subset of the things root can do. Root access is typically restricted to system administrators, but if you happen to support an application on a Linux server you may need root privileges to install, start, or stop it. There are ways to grant specific users root privileges for specific cases. This is often accomplished with the sudo -- SuperUser Do -- program.
