What is the primary difference between still wine and sparkling wine?

The primary difference between still wine and sparkling wine lies in the presence of carbonation. Still wine is defined as wine that does not contain any bubbles or effervescence, making it smooth and flat in texture. On the other hand, sparkling wine is characterized by its effervescence, which results from the presence of carbon dioxide bubbles. This carbonation can occur naturally during fermentation or can be introduced through specific winemaking techniques, such as the traditional method or tank method.

Understanding this distinction is crucial for recognizing different wine styles and their characteristics. Other options suggest attributes that don't accurately represent the fundamental difference between still and sparkling wines, such as sweetness levels or color classifications, which can vary across both categories. Thus, it's essential to focus on carbonation as the key differentiator between the two.