Compressed Natural Gas (CNG) is a type of fuel that is made from natural gas, primarily consisting of methane. It is stored at high pressure in special tanks and is used as an alternative to gasoline or diesel in vehicles. CNG is considered a cleaner fuel option because it produces fewer harmful emissions when burned. CNG is often used in public transportation, such as buses and taxis, as well as in some personal vehicles. The use of CNG can help reduce air pollution and dependence on oil, making it an environmentally friendly choice for many drivers.