The driving wheel of a car is the wheel connected to the drive axle. The friction force on the ground is forward, which provides driving force for the driving of the vehicle.
After the power of the automobile engine passes through the gearbox, it is transmitted to the drive wheels through the drive axle to provide power for the driving of the vehicle. The role of the drive wheel is not only to support the weight of the car, but also to output power and torque.