**Seat belts** are part of the **passive safety** in a vehicle. Passive safety refers to the elements that protect the vehicle's occupants and other users in the event of an accident, reducing the injuries they may suffer. These elements operate automatically, without the need for driver intervention.

The seat belt is a clear example of passive safety. Its main function is to keep people in their seats during an impact or rollover, preventing them from being ejected from the vehicle. This significantly increases the chances of surviving an accident. Moreover, the correct use of the seat belt has contributed to reducing the number of deaths in traffic accidents.

Therefore, seat belts are an essential component of passive safety, as their objective is to minimize injuries in the event of an accident.