What is active stability control?

Active means that the car itself will do things to counteract the instability of the vehicle. For instance the vehicle computer may activate one or more brakes on a wheel or wheels to counteract the pitching or swerving of a car that is not being driven correctly. This possibly could involve control of the steering wheel on future cars that may be built with this feature. At present, it is limited to applying brakes and adjusting the suspension during a bad maneuver to try to stabilize the car.