What is a key difference between the production of red and white wines?

The production of red wines involves fermenting the juice along with the grape skins, allowing the wine to extract color, flavor, and tannins from these skins. This combination is fundamental in creating the characteristic bold flavors and deeper hues associated with red wines. The process also contributes to the structure and mouthfeel of the wine, making it an essential part of red wine production.

In contrast, white wines are typically produced by fermenting the juice alone, without the skins, which results in a lighter color and different flavor profile. The skin-free fermentation allows for a range of fresh and fruity notes that are prevalent in many white wines. Given this context, the fermentation process is indeed a significant distinction between the two types of wine, making the choice that highlights the role of grape skins in red wine production the most accurate answer.