In a car crash what does wearing a seat belt do?

Wearing a seat belt during a car crash significantly enhances occupant safety by restraining them in their seats, which reduces the risk of ejection from the vehicle. It helps to distribute the forces of a collision across stronger parts of the body, minimizing injuries to vital organs and reducing the likelihood of severe trauma. Additionally, seat belts keep passengers in a controlled position, allowing airbags to function effectively and further protect against injury. Overall, seat belts are a crucial safety feature that can save lives and reduce injury severity in accidents.