The **headrest** is an element of **passive safety** in vehicles. Its main function is to **protect the neck and cervical spine** of passengers in the event of a sudden impact, such as an accident. This is achieved by minimizing the backward movement of the head, thus reducing the risk of injury.

- **Passive safety** refers to devices that help reduce passenger injuries during an accident, functioning automatically. Examples of these elements include the seatbelt, the airbag, and, of course, the headrest.

- It is crucial to adjust the headrest correctly: the top should be at the same height as the top of the passenger's head, and the distance between the head and the headrest should not exceed four centimeters. This ensures optimal protection.

Therefore, the headrest is not designed for comfort nor is it an active safety element, but rather an essential component of passive safety in vehicles.