A chlorofluorocarbon (CFC) is a chemical compound that contains carbon, chlorine, and fluorine. CFCs are used as refrigerants, aerosol propellants, and solvents. They are also used in the production of foam plastics and other materials.

CFCs are harmful to the environment because they contribute to the depletion of the ozone layer, which protects the Earth from ultraviolet radiation. CFCs are also greenhouse gases, which contribute to global warming.

The production and use of CFCs has been banned in most countries under the Montreal Protocol, an international treaty that was signed in 1987.