Whiskey is an alcoholic beverage distilled from fermented grain mash and aged in wooden casks. The grains used can include barley, corn, rye, and wheat. The whiskey making process involves malting, mashing, fermentation, distillation, and maturation. There are several types of whiskey defined by their country of origin, including Scotch whisky from Scotland, Irish whiskey from Ireland, American whiskey such as bourbon and Tennessee whiskey, Canadian whiskey, and Indian whiskey. Whiskey is served in various ways including neat, on the rocks, or with mixers.