Answer:
To protect you from fatal injuries and keep you secured in the case of an accident (my definition)
Explanation:
(Definition) Being buckled up during a crash helps keep you safe and secure inside your vehicle; being completely ejected from a vehicle is almost always deadly. If you don't wear your seat belt, you could be thrown into a rapidly opening frontal air bag. Such force could injure or even kill you.
Answer:
To keep you secured in case of an accident and because it is a law as well
