Pisco is a type of grape brandy that originated in the winemaking regions of Peru and Chile. It is a traditional and iconic spirit in both countries, with specific regulations governing its production and defining its characteristics. Here are key aspects of the definition of Pisco:

1. **Grape-Based Spirit:** Pisco is made from the fermentation and distillation of fresh grape juice. The choice of grape varieties can vary, but regulations often dictate specific types allowed for Pisco production.

2. **Geographic Origin:** Pisco has a protected designation of origin, meaning that it can only be produced in certain regions of Peru and Chile. In Peru, Pisco production is primarily centered in the Ica Valley, Arequipa, Moquegua, Tacna, and some areas of Lima. In Chile, Pisco is produced in designated regions, including the Coquimbo region.

3. **Production Method:** Pisco is typically made using a single distillation in pot stills. The resulting brandy is then rested in stainless steel or other inert containers, preserving its natural characteristics without the influence of wood aging.

4. **No Additives:** Pisco is not allowed to have additives such as water or flavorings. Its flavor profile is solely derived from the grapes used and the distillation process.

5. **Alcohol Content:** Pisco has a relatively high alcohol content, usually ranging between 38% and 48%. The strength can vary depending on the specific type of Pisco and the regulations of the producing country.

6. **Types of Pisco:** There are various types of Pisco, each with specific regulations regarding the grape varieties used, production methods, and aging:

   - **Puro (Pure):** Made from a single grape variety.

   - **Acholado:** A blend of different grape varieties.

   - **Mosto Verde:** Produced from partially fermented grape must, resulting in a slightly sweeter Pisco.

   - **Añejo:** Aged for a minimum period in wooden casks, developing additional flavors and aromas.

7. **Characteristics:** Pisco is known for its clean and vibrant fruit flavors, often showcasing notes of citrus, floral, and grape characteristics. The absence of wood aging allows the spirit to maintain its transparency and express the qualities of the grapes used.

8. **Traditional Cocktails:** Pisco is a key ingredient in classic cocktails such as the Pisco Sour, which includes Pisco, lime juice, simple syrup, egg white, and Angostura bitters.

Pisco holds cultural and historical significance in Peru and Chile, with each country having its own regulations and standards for the production of this distinctive grape brandy.