The use of dash cams in consumer vehicles is a relatively recent trend, and people have been driving just fine without them for a long time. However, while it might not be necessary, there are legitimate benefits to using a dash cam in your car.  Many people who purchase and install dash cams use them as a type of insurance policy for their actions and those of others on the road. Dash cams can protect you from other drivers in a number of ways. They can help you prove your innocence in the event of an accident. They may also act as a deterrent against aggressive drivers. And some dash cams come with features that have motion-sensor parking modes that can record any possible hit-and-runs or thefts while you are away from your car. In the end, it's ultimately up to you as to whether you believe the possible benefits of buying and using a dash cam are worth the investment.