It's about bridging the GAP.

Few moments match the excitement of driving your new vehicle off the lot for the first time. But from day one, most vehicles lose value quickly. If you’re financing your vehicle and it’s stolen and not recovered, declared a total loss after an accident, or deemed beyond repair due to a natural disaster, your auto insurance payment may not fully cover what you still owe. In many cases, insurance pays the vehicle’s actual cash value, not the full remaining loan balance.