There are thousands of varieties of grapes grown worldwide. Most wines, however, come from the classic European grapes in the Vitis vinifera family. These wine varietals are a subspecies of grape from vinifera with names like Pinot Noir and Chardonnay.
Some white wines are made from red grapes. Pinot Grigio grapes have red skins, but contain a grey-white juice on the inside. In fact, most red grapes give off white juice. The juice is left in contact with the skins after it's been crushed to let it pick up color and flavor.
White Zinfandel is actually pink, and half way between red wine and 
white. To make the sweet blush wine, winemakers allow the light colored Zinfandel juice to remain in contact for the first hour or two after extraction, then it's allowed to run off. This is how White Zinfandel gets it's pink hue.
For more information about Merlot, Cabernet Sauvignon, Riesling, Chardonnay, and more click here to explore our specific wine types.