So what exactly is whiskey? In the most basic definition, it’s a distilled alcoholic beverage made from fermented grain mash. Generally, the mash is aged in wooden casks which gives whiskey that distinct brown color and taste. Some of the more popular brands include, Jack Daniel’s, Maker’s Mark, Bulliet, Johnnie Walker, Macallan and Glenmorangie. However, within the category of “whiskey” lie several confusing subsets, often containing subtle (yet important) differences.