Red wine is much different from a white wine. First of all there are red wine grapes and white wine grapes, but sometimes you can use a white wine grape to make a red wine and vice versa. Some common red wine grapes are Merlot, Cabernet Sauvignon, Malbec, and Zinfandel. Red wine is made in a much different way than white wine. White wine only uses the juice of the grape nothing else. Red wine, on the other hand, uses the whole grape, from the juice to the skin and stems. The skins are what gives it its red color and tannins. Tannins are good for you and help against cardiovascular disease.
It's the skins of the grape that produce the tannins and that is why whites wine don't have any. Red wines tend to be a heavier wine also. Red wines are usually also aged longer to enhance flavors and aromas.