Wine

from fermented grapes, generally Vitis vinifera or its hybrids with Vitis labrusca or Vitis rupestris. Grapes ferment without the addition of sugars, acids, enzymes, water, or other nutrients,[1] as yeast consumes the sugar in the grapes and converts it to ethanol and carbon dioxide. Different varieties of grapes and strains of yeasts produce different styles of wine. These variations result from the complex interactions between the biochemical development of the grape, the reactions involved in fermentation, the terroir (the special characteristics imparted by geography, geology, climate, viticultural methods and plant genetics), and the production process. Many countries define 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.