Diet Coke (also known as Diet Coca-Cola) is a sugar-free soft drink produced and distributed by The Coca-Cola Company. It was introduced in the United States on Independence Day in 1982.
Diet Coke was sweetened with aspartame after the sweetener became available in the United States in 1983; to save money, this was originally in a blend with saccharin. After Diet Rite cola advertised its 100 percent use of aspartame, and the manufacturer of NutraSweet (then, G.D. Searle & Company) warned that the NutraSweet trademark would not be made available to a blend of sweeteners, Coca-Cola switched the formula to 100 percent NutraSweet. After many years the NutraSweet trademark expired and was never renewed by Coca-Cola, but the formula is still made with 100 percent aspartame. Diet Coke from fountain dispensers still contains some saccharin to extend shelf life.