Whisky is a strictly regulated spirit worldwide. It encompasses many national expressions and variations. The typical unifying characteristics of the different expressions and variations are the fermentation of grains, distillation, and aging in wooden barrels.
The spelling whiskey is commonly used in Ireland and the United States, while whisky is used almost exclusively in other whisky-producing countries.[1]
^Zandona, Eric; et al. (March 2013). A World Guide to Whisk(e)y Distilleries. Hayward: White Mule Press. ISBN978-0983638940.