Sparkling wine contains dissolved carbon dioxide that creates bubbles when the bottle is opened. The carbon dioxide can come from fermentation, from a second fermentation, or from carbonation. The method matters because it shapes texture, flavor, cost, and style.
Traditional method
The traditional method is the process most famously associated with Champagne, though many other regions use it too. A still base wine is bottled with yeast and sugar for a second fermentation inside the bottle. That fermentation creates carbon dioxide, which becomes trapped in the sealed bottle.
After fermentation, the wine rests on the dead yeast cells, known as lees. Lees aging can add flavors and textures often described as bread, biscuit, brioche, toast, cream, or nuts. The longer the wine ages on lees, the more prominent these notes may become, though grape variety, base wine, acidity, and producer style all matter.
The sediment must eventually be collected and removed. Riddling moves the sediment toward the neck of the bottle. Disgorgement removes it. The bottle is then topped up, often with a small addition called dosage, which can adjust balance and sweetness.
Tank method
In the tank method, the second fermentation happens in a sealed pressurized tank rather than in each bottle. The wine is then filtered under pressure and bottled. This method is often associated with fresh, fruit-driven sparkling wines such as many Prosecco styles, though the method is used more widely.
Tank-method sparkling wine can preserve primary fruit and floral aromas. It usually has less bottle-aged lees character than traditional-method wine, though exceptions exist.
Ancestral method
The ancestral method generally bottles wine before the first fermentation has finished. Fermentation continues in bottle, creating bubbles. Many pétillant-naturel, or pét-nat, wines use this broad approach. These wines may be cloudy or clear, dry or off-dry, rustic or precise. Because practices vary, the term should be used carefully.
Carbonation
Some sparkling wine is made by adding carbon dioxide directly. This can produce straightforward, fresh, affordable sparkling wine. It usually does not create the same fermentation-derived complexity as traditional-method wine, but it can serve a legitimate style goal.
Sweetness and dosage
Sparkling wine sweetness terms can be confusing because words such as brut, extra dry, sec, and demi-sec do not always mean what casual English suggests. Dosage after disgorgement can influence final balance. A high-acid sparkling wine may taste dry even with some residual sugar, while a lower-acid wine may taste softer.
Protected names
Not every traditional-method sparkling wine is Champagne. Champagne is a protected wine from the Champagne region of France made under its own rules. Cava, Crémant, Franciacorta, Cap Classique, English sparkling wine, and many New World sparkling wines have their own regional or legal contexts.