What are the key differences between brandy, cognac, and whiskey in terms of production, flavor profiles, and aging processes?

Brandy, cognac, and whiskey differ in their production methods, flavor profiles, and aging processes. Brandy is made from fermented fruit juice, while cognac is a type of brandy specifically made in the Cognac region of France. Whiskey is made from fermented grain MASH. Brandy tends to have a fruity flavor, cognac has a more complex and refined taste, and whiskey often has a smoky or woody flavor. Brandy and cognac are aged in oak barrels, while whiskey can be aged in various types of barrels.