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Champagne is a sparkling wine produced by inducing the in-bottle secondary fermentation of wine to effect carbonation. It is produced exclusively within the Champagne region of France, from which it takes its name. While the term "champagne" is used by some makers of sparkling wine in other parts of the world, numerous countries limit the use of the term to only those wines that come from the Champagne appellation. In Europe, this principle is enshrined in the European Union by Protected Designation of Origin (PDO) status. Other countries, such as the United States, have recognized the exclusive nature of this name, yet maintain a legal structure that allows longtime domestic producers of sparkling wine to continue to use the term "Champagne" under specific circumstances.

Most Champagnes are made from a blend of Chardonnay and Pinot Noir, for example 60%/40%. Blanc de blanc (white of white) Champagnes are made from 100% Chardonnay. Possibly the most exquisite, and definitely the most expensive of these is grown in a single Premier cru vineyard in Le Mesnil-Sur-Oger for Salon. Blanc de noir (white of black) Champagne is pressed from 100% Pinot Noir or black grapes, using a special quick-pressing, so that the black colour of the skin does not stain the vin de presse (pressed grape juice).

Champagne is typically light in color even if it is produced with red grapes, because the juice is extracted from the grapes using a gentle process that minimizes the amount of time the juice spends in contact with the skins, which is what gives red wine its colour. Rosé wines are produced throughout France by leaving the clear juice of black grapes to macerate on its skins for a brief time. Rosé Champagne is notable as it is the only wine that allows the production of Rosé by the addition a small amount of red wine during blending. This ensures a predictable and reproducible colour, allowing a constant Rosé colour from year-to-year. The amount of sugar (dosage) added after the second fermentation and aging also varies:

* Brut Natural or Brut Zéro (less than 3 grams of sugar per liter)
* Extra Brut (less than 6 grams of sugar per liter)
* Brut (less than 15 grams of sugar per liter)
* Extra Sec or Extra Dry (12 to 20 grams of sugar per liter)
* Sec (17 to 35 grams of sugar per liter)
* Demi-Sec (33 to 50 grams of sugar per liter)
* Doux (more than 50 grams of sugar per liter)