Whisky or whiskey is a type of distilled alcoholic brew made from the fermentation of grain mash. Different grains (which may be malted) are used for several types, including barley, corn, rye, and wheat. Whisky is normally aged in wooden casks, which are often old sherry casks or may also be made of charred white oak.

Whisky is a strictly controlled spirit globally with many classes and types. The typical unifying characteristics of the various classes and types are the fermentation of grains, distillation, and aging in wooden barrels.