What impact does residual sugar have on a wine's taste?

Residual sugar significantly contributes to the sweetness of wine. This leftover sugar remains in the wine after fermentation is complete, imparting a sweet taste that can vary depending on the level of residual sugar present. In sweeter wines, this added sugar balances the acidity, creating a more harmonious profile that is often appreciated in dessert wines or certain varietals that are known for their sweetness, like some Rieslings or late-harvest wines.

Furthermore, the presence of residual sugar can also enhance the perception of fruit flavors in the wine, making them seem more pronounced and lush. This is particularly important in wine tasting, where sweetness can influence the overall enjoyment and pairing possibilities with different foods. Hence, the correct choice highlights the direct relationship between residual sugar and the sweetness experienced in the wine.