Think of body as the weight or thickness of the wine in your mouth. For example, a glass of water has little or no body—it just washes right off—compared to a glass of maple syrup, which most definitely feels heavy in your mouth. The same principle applies to wines, which are usually described as light-bodied, medium-bodied, or full-bodied. A Cabernet Sauvignon, for instance, is typically full-bodied, while a Pinot Noir would be considered a medium- or light-bodied wine. And in case you didn't know, the alcohol, glycerin, and sugar content of a wine determine the body.