Transmission: The transmission transfers power from the engine to the wheels.
Drivetrain: The drivetrain is the system of components that transfers power from the engine to the wheels.
Suspension: The suspension is the system of components that absorbs bumps and vibrations from the road.
Brakes: The brakes are the system of components that slow down or stop the car.
Steering: The steering system is the system of components that allows the driver to control the direction of the car.