Sweet cherries (Prunus avium) are a firm, juicy, glossy-skinned fruit believed to have originated in the Caucasus region and spread through Europe before reaching North America. They are sweeter and less acidic than tart or sour cherries (Prunus cerasus), which are used mainly for baking, preserves, and cooked sauces rather than eaten fresh. Sweet cherries are eaten fresh or used in pies, tarts, jams, and sauces, and pair well with chocolate, almonds, and dairy. They're highly perishable and best refrigerated and used within about a week, though they can be frozen, canned, or dried for longer storage.