A car has several mechanical systems, including the engine, transmission, suspension, steering, brakes, and auto electrical system.

The engine produces power by burning fuel and air, which drives the car's wheels through the transmission. The transmission changes the speed and torque of the engine to optimize power and efficiency.

The suspension system supports the weight of the car and its passengers, while also providing a smooth ride and handling. The steering system controls the direction of the wheels, allowing the driver to steer the car.