What is the main function of the headrest in a car?

The main function of the headrest in a car is to enhance safety for the occupants by preventing or reducing whiplash injuries during a rear-end collision. It supports the head and neck, minimizing the backward movement of the head, which can cause serious injuries. While headrests may contribute slightly to comfort, their primary purpose according to German traffic safety regulations is protection, not improving seating position or replacing seatbelts. Seatbelts remain essential and cannot be substituted by headrests.