Scotch Whisky, often simply referred to as Scotch, is a type of whisky (or whiskey) that originates from Scotland. It is known for its distinct production methods, regional variations, and stringent regulations that govern its production. Here are key elements of the definition of Scotch whisky:

1. **Geographical Origin:** To be classified as Scotch whisky, it must be produced in Scotland. The country's unique environmental conditions, including the water source, climate, and natural resources, contribute to the character of Scotch.

2. **Ingredients:** Scotch whisky is primarily made from malted barley, though other grains can be used. The use of peat in malting barley is a traditional practice in some regions, imparting a smoky flavor to the whisky.

3. **Distillation:** Scotch whisky must be distilled in Scotland in pot stills. The distillation process contributes to the spirit's flavor and character. The alcohol content is usually around 60-70% after distillation.

4. **Maturation:** Scotch whisky must be matured in oak casks for a minimum of three years. The maturation process allows the whisky to develop its flavors, aromas, and complexity. The casks used, such as bourbon barrels or sherry casks, also influence the final product.

5. **Age Statements:** Scotch whisky labels often carry age statements, indicating the minimum age of the youngest whisky in the bottle. Common age categories include 12, 15, 18, and 21 years.

6. **Regions:** Scotland is divided into several whisky-producing regions, each with its own characteristics. These regions include Highland, Lowland, Speyside, Islay, and others. Whiskies from each region may have distinct flavor profiles influenced by local factors.

7. **Types of Scotch Whisky:**

- **Single Malt:** Produced from 100% malted barley at a single distillery.

- **Single Grain:** Produced at a single distillery but may include other grains besides malted barley.

- **Blended Malt:** A blend of single malts from different distilleries.

- **Blended Grain:** A blend of single grain whiskies from different distilleries.

- **Blended Scotch Whisky:** A blend of both single malt and single grain whiskies.

Regulations

Scotch whisky production is regulated by the Scotch Whisky Regulations of 2009, which defines the standards and requirements that must be met for a whisky to be labeled as Scotch.