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It is simply a public record of activity(ies).

Posted using Partiko Android

Distribute a web computable, bind its Nodes in the truth indisputable, their voices submit to the Ledger Immutable -- that is what's called a Blockchain.

All in one, eh? :p I'm pretty sure that's not what you wanted, but I couldn't help myself.

Hahaha good point!

As its name indicates it corresponds to a "Chain", being the blocks, text files that contain the information that we want to save.