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.
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