What is the purpose of sulfites in winemaking?

Sulfites serve as preservatives in winemaking, playing a vital role in maintaining the wine's quality throughout its production and storage. Their primary function is to inhibit the growth of unwanted microorganisms, including certain bacteria and wild yeasts that can spoil the wine or alter its intended flavor profile. Additionally, sulfites help prevent oxidation, a process that can lead to undesirable changes in color, aroma, and taste. By stabilizing the wine, sulfites ensure that it retains its character and remains enjoyable for a more extended period once bottled.

Enhancing sweetness, adding acidity, or improving color involves other methods or components in winemaking, such as sugar for sweetness or acid adjustments for acidity, but these do not fall under the purview of sulfites. Thus, their preservation aspect is crucial in the overall winemaking process.