This is one of those things that's way out there, difficult to wrap your mind around but too cool to ignore. The idea here is to replicate the basic functionality of a database - specifically, the capacity to store data by some sort of identifier (a 'key') - but distributed across a large number of networked computers. The advantages are that it's scalable - as you grow, simply add more computers - and it's fault tolerant - even if some computers go down, data replication means that it's still available. Via Diigo.
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