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. Alcohol content in wine ranges from as low as 5.5% to 25% ABV, with fortified wines typically containing 15.5% to 25% ABV, with an average of 18%, and unfortified wines containing anywhere from 5.5% to 16% ABV, with an average of 11.6%.