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Caffeine is a bitter, white crystalline xanthine alkaloid that is a psychoactive stimulant drug. Caffeine was discovered by a German chemist, Friedrich Ferdinand Runge, in 1819. He coined the term kaffein, a chemical compound in coffee (the German word for which is Kaffee), which in English became caffeine (and changed to Koffein in German)

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Caffeine is one of the world's most widely used drugs. Some anthropologists believe its use may date back to the Stone Age. Pharmacologically, caffeine is one of a group of stimulants called methylxanthine, or xanthine, that occur naturally in some plants. Beverages made from the nuts, seeds or leaves of these plants are major sources of natural caffeine, such as coffee, made from the Coffea arabica plant; soft drinks, like Coca Cola, made from Kola nuts; and tea made from the leaves of Thea sinensis. Cocoa, used to make chocolate, contains caffeine as well as theobromine, another xanthine.

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