Of course you can drink any liquid in any container that can hold liquid anyway. But if you want to be proper, show good manners and sophistication, then you should drink wine in a wine glass. And drinking wine from a wine glass has its reasons.
The shape of the glass is also very important, as it concentrates the flavor and aroma (or bouquet) to emphasize the varietal's characteristic. One common belief is that the shape of the glass directs the wine itself into the best area of the mouth from the varietal.
Generally, the opening of the glass is not wider than the widest part of the bowl.
The stem of a glass provides a way to hold the glass without warming the wine from body heat. Visually, a stem prevents fingerprints from smearing the glass. A new trend for wine glasses is the "stemless" wine glass which come in a variety of sizes and shapes as well. These glasses are typically more casual than their traditional counterparts, as they negate the benefits of using stemmed wine glasses..
Except for the wine connoisseur, wine glasses can be divided into three types: red wine glasses, white wine glasses, and champagne flutes.