It seems like "tart" means something (as in food) has a slightly sour bite to it. But often, it is something that can be quite delicious. "Sour", to me, implies that something has a stronger, sour taste to it and often, that taste is not desirable.
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lllawIs tart only used for describing fruit?No, but it is common in describing fruit. It might also describe the taste of a beverage, for example, a lemonade.
lllawDoes sourUsually, yes, but not necessarily. There is some overlap, and sometimesimpliesimply it's unpleasant?