Whisky, or whiskey, refers to a broad category of alcoholic beverages that are distilled from fermented grain mash and aged in wooden casks (generally oak). Different grains are used for different varieties, including barley, malted barley, rye, malted rye, wheat, and maize (corn).

Types of Whisky

Whisky or whisky-like products are produced in most grain-growing areas. They differ in base product, alcoholic content, and quality.

• Scotch Whiskies are generally distilled twice, though some are distilled a third time. International laws require anything bearing the label "Scotch" to be distilled in Scotland and matured for a minimum of three years in oak casks. There are various terms which are fairly common in the spirit (or at least, whisky) world but which have special meaning in the Scotch whisky industry as described below.
• Age Statement. Whiskies do not mature in the bottle, only in the cask, so the "age" of a scotch is the time between distillation and bottling. This reflects how much the cask has interacted with the whisky, changing its chemical makeup and taste. Whiskies which have been in bottle for many years may have a rarity value, but are not "older" and will not necessarily be "better" than a more recently made whisky matured in wood for a similar time. If the whisky is from more than one cask, then if it includes an age statement on the bottle, it must reflect the age of the youngest whisky in the blend. Many cask-strength single malts also omit the age as they use younger elements in minute amounts for flavoring and mellowing.
• Malt Whisky is whisky made entirely from malted barley and distilled in an onion-shaped pot still.
• Vatted Malt Whisky is blended from malt whiskies from different distilleries. If a whisky is labelled "pure malt" or just "malt" it is almost certain to be a vatted whisky. This is also sometimes labeled as "Blended Malt" whisky.
• Single Malt Whisky is from a single distillery, but will usually contain whisky from many casks, so the blender can achieve a taste recognisable as typical of the distillery (unless the whisky is described as "single-cask"). In most cases, the name of the whisky will be that of the distillery (Glenlivet, Glenmorangie, Glenfarclas), with an age statement and perhaps some indication of some special treatments such as maturation in a port cask. Especially expensive malts may have a special name.
• Grain Whisky is made from malted and unmalted barley along with other grains, usually in a continuous "patent" or "Coffey" still. Until recently it was only used in blends - but there are now some "Single Grain" scotches being marketed.
• Blended Whiskies are the cheaper whiskies made from a mixture of Malt and Grain whiskies. If they use only a blend of single-malts they can be referred to as "Blended Malt" (see also Vatted Malt), and if they are comprised solely of single-grains you will sometimes see the designation "Blended Grain." A whisky simply described as Scotch Whisky is most likely to be a blend. A blend is usually from many distilleries so that the blender can produce a flavour consistent with the brand, and the brand name (eg Bells, Chivas Regal) will usually not therefore contain the name of a distillery.
• Irish Whiskeys are generally distilled three times and must be aged in wooden casks for a period of not less than three years. Unpeated malt is almost always used.
• Canadian Whiskies have the regulatory requirement[5] of being aged for at least three years in a barrel. Most Canadian whiskies are blended multi-grain whiskies.
• American Whiskey includes both straights and blends. To be called "straight" the whiskey must be one of the "named types" listed in the federal regulations and aged in oak casks for at least two years. The most common of the "named types" are Bourbon, which must be between 51% and 79% (inclusive) corn (maize); rye, which must be at least 51% rye, and corn, which must be at least 80% corn. All straight whiskeys except straight corn whiskey must be aged in new casks that have been charred on their inside surface. American blended whiskeys combine straight whiskey with un-aged whiskey, grain neutral spirits, flavorings and colorings. These definitions are part of U.S. law. Not defined by the law but important in the marketplace is Tennessee whiskey, of which Jack Daniel's is the leading example. It is identical to bourbon in almost every important respect. The most recognizable difference is that Tennessee whiskey is filtered through sugar maple charcoal, giving it a unique flavor and aroma.
• Grain Whisky differs from malt in that it is usually made from corn, maize, or other grains rather than malted barley. It is distilled in continuous distillation process stills known as Coffey stills instead of the pot still used for malt whisky.
• Pure Pot Still Whiskey refers to Irish whiskey made from a combination of malted and unmalted barley and distilled in a pot still.