Fenders are protective devices used on vehicles, boats, and bicycles to absorb impact and prevent damage. In cars, fenders are the panels that cover the wheel wells, helping to shield the body from dirt, debris, and minor collisions. They also play a role in the vehicle's aerodynamics and overall design. On boats, fenders are inflatable or foam-filled cushions that hang over the sides to protect the hull from damage when docking or mooring. They act as a buffer between the boat and the dock or other vessels, reducing the risk of scratches and dents. Fenders are essential for maintaining the integrity of both vehicles and boats.