Because you're only human, driving on the road may not be the safest thing to do. There will always be times when a mental lapse or mistake during driving could spell the difference between life and death, or at least a fender bender and scrap heap. Also, since cars drive at high speeds in the highway, it's almost certain that you'll incur substantial damage on the vehicle in the event of a traffic mishap. Again, keep in mind the fender bender and scrap heap analogy.
During such nightmarish incidents, having your scrap heap repaired of buying new parts can be the least of your worries. At times, in terrible incidents where your vehicle is damaged beyond repair, replacement is the only option. No wonder car insurance is compulsory in the United States! In times like this, auto insurance is there to help you, as it gives you security and service by paying for any loss or damage to your automobile incurred through vehicular accidents. By paying a (in most cases) monthly fee, the insurance company gives you complete car-accident coverage, taking care of all expenses in the face of such abominable events.
All the same, auto insurance has among the most complicated types of contracts and insurance policies you will ever see, because it's not just limited to damage and loss of your vehicle from traffic mishaps. For those with no experience with buying insurance, keep in mind that auto insurance policies all have their own terms and conditions that, if not met, will result in you not getting any payment for your accident. For example, a tree falling on your automobile isn't usually covered by your auto insurance policy, because that is not considered a traffic accident. So reading and understanding the insurance policy you've availed is probably in your best interests.