A sway bar bush in a car is an essential component of the suspension system. It is typically made of rubber or polyurethane and is responsible for connecting the sway bar to the vehicle's frame. The primary purpose of the sway bar bush is to reduce body roll during cornering, enhancing stability and control of the vehicle.

The sway bar, also known as an anti-roll bar or stabilizer bar, is designed to resist the tendency of the car to lean to one side during turns. The sway bar bush acts as a cushion or buffer between the sway bar and the frame, providing flexibility and absorbing vibrations. This helps to maintain proper contact between the tires and the road, ensuring improved handling and preventing excessive tire wear. Additionally, the sway bar bush minimizes noise and vibrations, enhancing the overall driving experience.