Irish whiskey isn't just defined by being made in Ireland—it's governed by strict legal standards that determine how it's produced, aged, and labeled. Understanding those rules also helps clarify how Irish whiskey differs from Scotch and bourbon, whether it's the use of unmalted barley, column still distillation, or cask requirements. Knowing these distinctions can make it easier to choose the right bottle—whether you’re ordering at a bar, building a home bar, or shopping for something new.