What Is Wine?

Wine is an alcoholic beverage made by fermenting the juice of grapes. While other fruits can be fermented into alcoholic drinks, the term "wine" without qualification refers specifically to the fermented juice of Vitis vinifera, the European grapevine species that produces nearly all the world's commercial wine.

The transformation from grape to wine happens through fermentation, a natural process where yeasts (primarily *Saccharomyces cerevisiae*) consume the sugars in grape juice and convert them into alcohol (ethanol) and carbon dioxide. This process typically produces wines with alcohol levels between 8% and 15% ABV, though fortified wines can reach 20% or higher.

What makes wine unique among fermented beverages is the grape itself. Wine grapes differ significantly from table grapes: they're smaller, sweeter, have thicker skins, and contain more seeds. These characteristics contribute to wine's complexity, providing sugars for fermentation, tannins for structure, and aromatic compounds for flavor.

Legal definitions vary by region but share common ground. The European Union defines wine as "the product obtained exclusively from the total or partial alcoholic fermentation of fresh grapes, whether or not crushed, or of grape must" (EU Regulation 1308/2013). The U.S. Tax and Trade Bureau (TTB) similarly defines wine as produced from grapes, though it permits the term "wine" with qualification for other fruits (e.g., "apple wine").

The International Organisation of Vine and Wine (OIV), representing 48 member countries, standardizes definitions and practices globally. According to OIV, wine must derive exclusively from grapes and contain no added water or alcohol from external sources—though winemaking practices like chaptalization (adding sugar before fermentation) are permitted in some regions.

Understanding this foundation is essential for anyone working in hospitality. When a guest orders wine, they're asking for a product with thousands of years of history, strict production standards, and a flavor profile shaped by grape variety, climate, soil, and human craft.