Comprehensive coverage: This covers things that could happen to your car not related to an accident that might not be covered by standard insurance, such as weather damage, running into an animal or other factors. It’s a good idea to opt for comprehensive coverage if you can afford it, but it can get costly and might not be worth it if you drive an old or inexpensive car.
There isn’t a definitive answer to the question, “which company is the cheapest?” Some companies are cheaper than others, plain and simple, but individual details of your driving profile can affect which companies offer you the cheapest rates. For example, while Nationwide wasn’t the cheapest for a driver with a clean record, it was the relatively cheap for a driver following an at-fault accident. The best way to find cheap car insurance is to compare as many companies as possible using your driving profile.
Comprehensive car insurance covers damages from an "act of God," or events that are not caused by a car driving into something else. An "act of God" can include things like damage from a heavy tree branch falling on your car. Since you have no control over when or why a tree branch would fall on your car, this kind of accident would be covered under your comprehensive policy.