Most passenger vehicles equip power steering. Depending on the assist system of power, there are 3 different power steering.

1. Hydraulic power steering

This is hydraulic power assisted power steering that comes from power steering oil pump. Most passenger vehicles equip this system.

2. Electric power steering.

This is electric power assisted power steering that comes from electric motor instead of power steering oil pump.

3. Next generation electric power steering.

The system is roughly same as ordinary electric power steering, but the biggest difference is that the driver doesn't control steering directly. Signals of input & output movement of steering from the sensor are sent to the control computer, and steering actuator that received signals from the computer moves steering gearbox. It looks like fly-by-wire system of airplanes.