An automobile is a car: a vehicle with four wheels and an internal combustion engine. The automobile is one of the most common ways to travel.
Thanks in part to Henry Ford, automobiles are just about everywhere: in cities, small towns, and even in rural areas, where it's too far to walk from place to place and there's very little public transportation. Trucks, vans, buses, and limousines are bigger than the typical automobile, but they’re automobiles, too. A motorcycle isn't an automobile because it only has two wheels. Automobiles are good for getting around, but they also cause pollution and automobile accidents.