Automobiles are four-wheeled vehicles used for transportation. They are powered by internal combustion engines or electric motors. Depending on the type of automobile, its systems can be designed for off-road use, passenger comfort and high-speed handling. Most modern automobiles burn gasoline (also called petrol or gasohol), although some run on diesel fuel or liquefied petroleum gas. Automobiles can also be powered by other fuels such as kerosene, coal or wood. Some modern automobiles are designed to be fully refuelled and recharged at home or at stations that offer refuelling services.

The modern automobile is the result of many developments in engineering, manufacturing and design. Its popularity has increased since World War II, and it is now one of the most common forms of transport in the world. It has revolutionised the way people live, work and play. Many modern jobs would be impossible without access to an automobile.

Until the late 19th century, most automobiles were powered by steam or electricity. These were heavy and slow to drive, but improved steam and electric vehicles became more common later in the century. In the 1920s, American carmaker Henry Ford revolutionized production methods by using an assembly line to make automobiles more quickly and cheaply. This allowed him to sell millions of his Model T vehicles at a low price.

Increasing numbers of people are choosing to own their own automobiles, rather than using public transport. This is partly because of the convenience, safety and freedom that they provide. However, the increased number of automobiles on the road can lead to traffic congestion and air pollution. In addition, they can cause injury or death when they crash. For these reasons, many countries have laws to regulate how and where automobiles are driven.