Wine grapes have a number of naturally occurring acids, including tartaric, malic, and citric.
They are what gives many wines their pleasing and refreshing tartness. The texture of a wine created by acidity, tannin, or both. Big, full-bodied reds are usually said to have a good deal of backbone. Wines without backbone taste softer and are gentler on the palate. Wine has a number of components competing for your attention, including fruit, acids, alcohol, sometimes tannins, sometimes sugar, sometimes oak.