Wine is an alcoholic drink typically made from fermented grapes. Yeast consumes the sugar in the grapes and converts it
to ethanol and carbon dioxide, releasing heat in the process. Different varieties of grapes and strains of yeasts are
major factors in different styles of wine. These differences result from the complex interactions between the
biochemical development of the grape, the reactions involved in fermentation, the grape's growing environment (terroir),
and the wine production process. Many countries enact legal appellations intended to define styles and qualities of
wine. These typically restrict the geographical origin and permitted varieties of grapes, as well as other aspects of
wine production. Wines can be made by fermentation of other fruit crops such as plum, cherry, pomegranate, blueberry,
currant and elderberry.