Grape skins are the outer protective layer of grapes, which play a crucial role in the fruit's development. They contain important compounds, including antioxidants, vitamins, and dietary fiber. The color of grape skins can vary, ranging from green to red to black, depending on the grape variety. In winemaking, grape skins are essential for extracting flavors, colors, and tannins during the fermentation process. This is particularly important for red wines, where the skins are left in contact with the juice to enhance the wine's character. The presence of grape skins also contributes to the health benefits associated with red wine.