An air spring is a flexible, textile-reinforced rubber bellows that uses compressed air to support vehicle loads, maintain ride height, and absorb road vibrations. Commonly referred to as air bags or pneumatic springs, they replace or assist traditional steel coil or leaf springs. By dynamically adjusting internal air pressure, air springs provide a highly customizable and plush ride. They are widely used in passenger cars, electric vehicles, heavy-duty commercial trucks, buses, trains, and industrial machinery.