Gas or oil is a type of FUEL used to power many machines, such as cars, boats, and airplanes. It is a liquid or gas that is burned to produce energy. Gasoline and diesel are the most common types of gas or oil used for FUEL, but other types such as kerosene, propane, and natural gas can also be used. Gas or oil is an important part of the global economy, and its production and consumption have a significant impact on the environment.