Fuel is a substance that provides energy, often used to power vehicles, machines, and even homes. Common types of fuel include gasoline, diesel, and natural gas. These fuels release energy when burned, which can be converted into motion or electricity. In addition to fossil fuels, there are also renewable sources of fuel, such as biofuels and solar energy. These alternatives are becoming more popular as people seek to reduce pollution and combat climate change. By using different types of fuel, we can meet our energy needs while also protecting the environment.