Decaffeinated drrinks are caffeinated drinks, teas, coffees etc, from which the caffeine has been removed. This can occur by the use of a number of processes. To quote Wikipedia, "The process is usually performed on unroasted (green) beans, and starts with steaming of the beans. They are then rinsed with a solvent that contains as much of the chemical composition of coffee as possible without also containing the caffeine in a soluble form. The process is repeated anywhere from 8 to 12 times until it meets either the international standard of having removed 97% of the caffeine in the beans or the EU standard of having the beans 99.9% caffeine free by mass. Coffee contains over 400 chemicals important to the taste and aroma of the final drink; this makes it challenging to remove only caffeine while leaving the other chemicals at their original concentrations. Coffea arabica normally contains about half the caffeine of Coffea robusta. A Coffea arabica bean containing little caffeine was discovered in Ethiopia in 2004."