Definition: The acidity in wine is really the sour-factor. If a wine is overly sour it is labeled as "tart" if it has very little acidity it is called "flat." The acid in wines is derived from the grapes used to make the specific wine. Acidity allows wine to maintain its freshness while also molding its flavor components.
Acidity in Wine
By Stacy Slinkard, About.com
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