A wheel hub is the central part of a wheel that connects it to the axle of a vehicle. It allows the wheel to rotate smoothly while supporting the weight of the vehicle. The hub typically contains bearings that reduce friction and enable easy movement. In addition to its primary function, the wheel hub also houses the brake components and may include features for attaching the wheel itself. Proper maintenance of the wheel hub is essential for vehicle safety and performance, as a damaged hub can lead to handling issues and increased wear on other parts like the tires and brakes.