Side skirts refer to a type of automotive body modification that involves adding wide, low-profile panels along the sides of a vehicle. These side skirts are designed to improve aerodynamics and enhance the overall appearance of the car by creating a sleeker look. They can also provide additional protection for the wheels and undercarriage from road debris or curbs. Side skirts are typically made from lightweight materials such as plastic, carbon fiber, or fibreglass, and are often custom-fitted to each specific make and model of car.