Invented by John Pemberton as a medicine, Coca-Cola (Coke) dominated the soft drinks market throughout the 20th Century. The name derives from two of the (original) ingredients, coca leaves and kola nuts. The recipe has always been a closely-guarded trade secret of the Coca-Cola Company, which makes a concentrated version of the carbonated drink. This concentrate is combined with filtered water and sweeteners before being carbonated and canned (or bottled) by companies across the world. Famous for its shapely glass bottles, cans of Coke first appeared in 1955.