A wheel bearing is a crucial component in a vehicle's wheel assembly that allows the wheels to rotate smoothly. It consists of a set of steel balls or rollers encased in a metal ring, which reduces friction between the wheel and the axle. Proper functioning of the wheel bearing ensures stability and safety while driving. When a wheel bearing wears out, it can lead to noise, vibration, and even wheel failure. Regular maintenance and inspection are important to prevent issues. If a wheel bearing fails, it may require replacement to maintain the performance of the vehicle and ensure the safety of the driver and passengers.