What feature differentiates sparkling wine from still wine?

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The key feature that distinguishes sparkling wine from still wine is the fermentation method that produces bubbles. Sparkling wine undergoes a secondary fermentation, which can occur in the bottle or in large tanks, creating carbon dioxide as a byproduct. This carbon dioxide is what forms the bubbles characteristic of sparkling wines.

In contrast, still wines do not undergo this secondary fermentation, resulting in a flat texture without bubbles. The method of producing these bubbles is central to defining the category of sparkling wines, such as Champagne or Prosecco, and is instrumental in creating the effervescence that sets them apart from still wines.

The other options, such as the type of grapes used or aging time in barrels, can vary widely among both sparkling and still wines and do not serve as definitive characteristics for classifying them. The presence of a cork is common to many types of wine, further emphasizing that it is not a differentiating factor.