What is Perfluoro octane sulfonate (PFOS) and perfluorooctanoic acid (PFOA)?

Are widely used as a nonstick, waterproof stain-resistant product such as Teflon, Gortex, Scotchguard, and Stainmaster. The industry makes use of their slippery, heat-stable properties to manufacture everything from airplanes and computers to cosmetics and household cleaners.