The suspension of a car is a system that connects the wheels to the vehicle's body and absorbs shock from the road. The suspension system is composed of springs, dampers, and anti-roll bars, and it works by allowing the wheels to move independently of the vehicle's body, which reduces the amount of shock and vibration that is transferred to the passengers. There are several different types of suspension systems, including independent suspension, semi-independent suspension, and solid axle suspension. Each type of suspension system has its own advantages and disadvantages, and the type of suspension system used in a car will depend on the vehicle's intended use.