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+Redis is an advanced key-value store. It is similar to memcached but the
+dataset is not volatile, and values can be strings, exactly like in memcached,
+but also lists, sets, and ordered sets. These data types can be manipulated
+with atomic operations to push/pop elements, add/remove elements, perform
+server side union, intersection, difference between sets, and so forth.
+Redis supports different kinds of sorting abilities.