Red wine glasses and White wine glasses differ in shape and size, driven by the types of wine they are intended to hold. Typically Red wine glasses will be a bit taller and have a larger bowl than White wine glasses. In general Reds are bigger and bolder wines so they require a larger glass to allow all those aromas and flavors to emerge. "But do I need both types?" While you can certainly get by with one set of glasses, if you expect to drink a number of different varietals you may find that the glassware is holding back your experience, particularly if you opt to drink Red wine out of a smaller White wine glass. Does that mean you won't enjoy your wine? Most definitely not. While the various shapes and sizes can be overwhelming, a proper varietal-glass pairing a proper varietal-glass pairing can make a tremendous difference.