Output characteristics of power transistors
power mosfet behave like normal mosfet, but look on the datasheet on the right, power mosfet got a real high gain in current.

These devices can handle a lot of current as you can see hundreds of amp, a normal mosfet can barely handle over 500 mA. So these output stage mosfet are use to power motor and high current device.

Regards, MathieuL.