Automobiles are vehicles that use the energy of an engine (often called a motor) to move. The energy comes from the burning of a fuel, usually gasoline, or by electrical power, from batteries. The energy is sent from the engine to the wheels through a transmission system. The car is equipped with controls for steering, braking and other functions. Many automobiles also have radios and other entertainment systems, and some even have air conditioning.
People who own cars can save time by not having to worry about making sure they leave early enough to catch a bus or train. It also gives them freedom to travel where and when they want, for business or pleasure. Having their own vehicle allows people to visit friends and family, attend sporting events and concerts, and take vacations.
Most automobiles today are powered by an internal combustion engine that burns fuel, usually gasoline, to create the energy it needs to move. The resulting pollution contributes to climate change. Many places with crowded roads have public transportation like buses, trains (steam-powered, diesel-powered, monorail or light rail), trams and subways that can get people where they want to go more quickly and cheaply than an automobile can.
Automakers must keep in mind that their customers have a variety of tastes and budgets when designing and producing vehicles. They also must consider the costs of raw materials and environmental impact when making choices about how to build their vehicles.