Whiskey is a distilled alcoholic beverage made from fermented grain mash. Common grains used include barley, corn, rye, and wheat. The production process involves mashing the grains, fermenting the mash, distilling the liquid, and aging it in wooden barrels, typically made of oak. The aging process contributes to the flavor and color of the whiskey. There are several types of whiskey, including Scotch, Irish whiskey, bourbon, and rye whiskey. Each type has its own unique characteristics based on the ingredients used, the distillation process, and the aging conditions. Whiskey is enjoyed neat, on the rocks, or in cocktails.