The **headrest** is a passive safety device in vehicles designed to **protect the neck and cervical vertebrae** in the event of a sudden impact. The cervical vertebrae are the bones located at the top of the spinal column.

For the headrest to perform its function effectively, it is crucial that it is positioned correctly. The top of the headrest should be at the same height as the top of the passenger's head. Additionally, it is recommended that the distance between the head and the headrest be four centimeters or less. This helps minimize the risk of cervical injuries in the event of an accident.

Therefore, the main mission of the headrest is to prevent or reduce the severity of **cervical** injuries.