Chlorofluorocarbon, klawr uh floor uh KAHR buhn, is any of a group of synthetic organic compounds that contain chlorine, fluorine, and carbon. The two most common chlorofluorocarbons (CFC's) are trichlorofluoromethane, also called CFC-11, and dichlorodifluoromethane, or CFC-12. They are used as refrigerants in air conditioners and refrigerators and to make plastic foams for furniture and insulation. Chlorofluorocarbons are sometimes referred to simply as fluorocarbons, though there are other types of fluorocarbons that do not contain chlorine.