A hub cap, often referred to as a wheel cover, serves both aesthetic and functional purposes in a vehicle. It is typically made of metal or plastic and is designed to fit over the center part of a wheel. By covering the wheel's hub, the hub cap plays a crucial role in enhancing the overall appearance of the car, providing a polished and finished look to the wheels. Additionally, hub caps can come in various designs and finishes, allowing car owners to customize their vehicles according to their personal style.

Functionally, hub caps help protect the wheel's hub and the lug nuts from dirt, debris, and moisture, which can lead to corrosion and damage over time. They also contribute to the aerodynamics of the vehicle by streamlining airflow around the wheels. Some hub caps are specifically designed to improve fuel efficiency by reducing drag. In certain vehicles, hub caps may even contain features such as wheel locks or sensors for tire pressure monitoring, further enhancing the utility of this often-overlooked component.