Compressed natural gas (CNG) is a type of fuel that is made by compressing natural gas, which primarily consists of methane. This process reduces the gas's volume, making it easier to store and transport. CNG is often used as an alternative to gasoline or diesel in vehicles, as it burns cleaner and produces fewer emissions. CNG is stored in high-pressure tanks and can be used in specially designed CNG vehicles. These vehicles are equipped with engines that can efficiently use this fuel. The use of CNG helps reduce air pollution and dependence on oil, contributing to a more sustainable energy future.