Jack Daniel's, also known as Old Number 7 or more commonly as JD is one of the best selling whiskies in the world. Made in the Tennessee Sour Mash style, it is very similar to bourbon with the additional step of dripping the fresh make spirit through a vat of sugar maple charcoal to mellow the whiskey before going into barrel. The result is a smooth, versatile whiskey that is true to its country roots.