Cars are vehicles that are powered by an engine and used for transportation. They are made up of a chassis, which is the frame of the car, and other components such as an engine, wheels, and a steering wheel. They come in all shapes and sizes, from compact cars to large trucks. Cars are used by people all over the world for a variety of purposes, from commuting to work to travelling for leisure. They can be powered by a variety of sources, from gasoline to electricity. In the United States, cars are the largest source of greenhouse gas emissions. An analogy for cars is that they are like horses. Just like horses, cars have an engine that powers them and require fuel to run. They can take you from point A to point B, and some cars are even designed to look like horses. Fun Fact: The longest car in the world is 100 feet long and was built in Germany in 2011. It has 26 wheels and is powered by two engines.