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A Cache, Session Store, Message Queue (RedisMQ), Distributed Pub/Sub Messaging, Locking (i.e. between AppServers), Rate Limiting, Analytics, Timings, etc.

Basically a swiss-army knife that you don't want to be without when developing high performance systems.

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I saw a great picture from a slide deck. It had a picture of Batman labeled, "Your Application".

Then on the next slide, it added an arrow pointing at Batman's utility belt, and labeled it "Redis".

Found it: http://www.scribd.com/doc/34269414/Redis-Persistence-Power

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