Whiskey is a distilled alcoholic beverage made from fermented grain mash. Various grains (which may be malted) are used for different varieties, including barley, corn, rye, and wheat.  Whiskey is typically aged in wooden casks, generally made of charred white oak, which gives it its distinct flavor and color. There are several types of whiskey, each with its unique characteristics:

• Bourbon: An American whiskey made primarily from corn (at least 51%) and aged in new charred oak barrels.
• Rye Whiskey: Made primarily from rye (at least 51%) and also aged in new charred oak barrels.
• Irish Whiskey: Generally made from a mix of malted and unmalted barley, triple distilled, and aged for at least three years.
• Canadian Whisky: Often a blend, typically lighter and smoother, with fewer regulations on ingredients.

Scotch is a type of whiskey that is made in Scotland, and it has its own set of regulations:

• Single Malt Scotch: Made from 100% malted barley and produced at a single distillery using pot stills.
• Single Grain Scotch: Made at a single distillery but can use other grains in addition to malted barley.
• Blended Malt Scotch: A blend of single malts from different distilleries.
• Blended Grain Scotch: A blend of single grain scotches from different distilleries.
• Blended Scotch: A mix of single malt and single grain scotch whiskies.

Scotch whisky must be aged in oak barrels for at least three years and one day, and it is often aged much longer. The flavor of Scotch can vary widely depending on the region it comes from, with notable regions including:

• Highlands: Generally robust and complex, with some peat and smoke.
• Lowlands: Lighter and more delicate, often grassy or floral.
• Speyside: Known for being sweet and rich, often with fruity notes.
• Islay: Famous for heavily peated and smoky whiskies.
• Campbeltown: Varied styles but often have a slight saltiness due to their coastal location.

The difference between “whiskey” and “whisky” primarily lies in the geographical origins and spelling conventions:

1. Whiskey (with an “e”): This spelling is typically used for spirits produced in Ireland and the United States. For example:
   • Irish Whiskey: Generally smooth and triple-distilled, made from a mixture of malted and unmalted barley.
   • American Whiskey: Includes bourbon, rye, Tennessee whiskey, and others, each with specific production methods and aging requirements.
2. Whisky (without an “e”): This spelling is commonly used for spirits produced in Scotland, Canada, and Japan. For example:
   • Scotch Whisky: Must be made in Scotland and aged for at least three years in oak barrels. It includes single malt, single grain, blended malt, blended grain, and blended Scotch whiskies.
   • Canadian Whisky: Often a blend, usually lighter and smoother, and aged for at least three years.
   • Japanese Whisky: Modeled after Scotch whisky, with a growing reputation for high quality and distinct flavors.

The choice of spelling reflects the cultural and historical preferences of the regions where the spirits are produced. Despite the spelling differences, the basic process of making whiskey/whisky involves distilling fermented grain mash and aging it in wooden casks, which imparts flavor and character to the final product.