Differential

differential or "diffs"is a device which transmitts torque and rotation through three shafts, one input and two output, also allowing one of the output to rotate at a different speed than the other.

The purpose of differential is that

1. to aim the engine power at the wheel
2. To act as the final gear reduction in the vehicle, slowing the rotational speed of the transmission one final time before it hits the wheels
3. To transmit the power to the wheels while allowing them to rotate at different speeds

I haven't done any of the idfferential classes because of sickness. so what i had to do was just research till i understood. Still got little bit confused but as far as i got the general purpose of differential, i would know the process of it.