Device Rooting
The root user, or superuser, is a special user account in OS X that can modify and delete critical system files. By default, the root user is not enabled. Warning: If you log in as the root user, use extreme caution. You can damage the system by moving or deleting important files.
it can run the sudo command, and has enhanced privileges allowing it to run apps like Wireless Tether or SetCPU. You can root either by installing the Superuser application or by flashing a custom ROM that includes root access.