The most standard answer to this question is that wine is made by fermentation. There are, of course, lots of more details included in making white wine.
try this site White wine is made by squashing the grapes and separating the juice from the skins before fermentation. Red wine is made by squashing the grapes and permitting the skins to remain in contact with the juice during fermentation.
There are lots of various types of wine, and the details of how they are made differ depending on the style of red wine being produced. In basic, though, red wine is made by fermentation of grape juice. The kind of grape, the environment in which it was grown, and the soil composition all contribute in the flavor of the red wine. The fermenting and squashing procedure can also be manipulated to produce various flavors and designs of red wine.