What Is Whiskey?

Whiskey is, at its heart, a very simple idea: a distilled spirit made from fermented grain and aged in wooden casks. Everything else — country, grain mix, still, cask — is variation on that theme.

Universally, to legally call something whiskey a producer must:

• Ferment a mash of cereal grains (barley, corn, rye, wheat).
• Distill below 95% ABV so grain character survives.
• Age in oak casks (minimum times vary: Scotland/Ireland 3 years, US as little as 0 for corn whiskey but typically 2+ years).
• Bottle at minimum 40% ABV (in the EU, US, Canada).

The spelling is regional:

• Whisky — Scotland, Canada, Japan.
• Whiskey — Ireland, United States (most brands).

The four traditional beginner styles are:

• Scotch — made in Scotland; often malted barley; can be smoky.
• Irish — made in Ireland; typically triple-distilled and smooth.
• Bourbon — American; corn-forward; sweet vanilla and caramel.
• Rye — American (or Canadian); rye-forward; spicier, drier.

Each style tastes different because of the grain, water, still, cask, and climate — not because of magic.