Sometimes automotive websites are so overly technical that the average car shopper is left scratching his or her head. That’s why we launched Ask.cars.com, to answer all those questions you might have about cars and the car-buying process. Today we take on a question from Vladimir in Elizabeth, N.J. He wanted the cryptic term “rpm” explained, so we did just that. Check out our response and leave your own questions on Ask.cars.com.