Auto-Coordination

I'm just wondering, what does the "Auto-Coordination" feature do?? Is it Auto-Rudder? Sorry, for the stupid question.
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Turning Auto-Coordination On and Off
By default, Flight Simulator moves the rudder (or anti-torque pedals in the helicopter) automatically to maintain coordinated flight. If you have rudder pedals or a joystick such as the Microsoft Sidewinder that supports rudder control, you can add realism to your flights by turning off auto-coordination. Many aerobatic maneuvers require that you turn off auto-coordination.
To Turn Auto-Coordination On or Off
1 On the Aircraft menu, click Aircraft Settings.
2 Click the Realism tab.
3 Click Auto-coordination to turn this option on or off, and click OK.