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What is the difference between Hadoop, MongoDB, Big data ?

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3 different things.
Hadoop is a framework. Something you use to develop an entire application.
MongoDb is a db. A nosql one. It is where you store data.
BigData is a concept. It is related to huge quantity of data. Where huge is not a fixed parameter. 4 mb was huge in 1960. Now huge means several terabyte.

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    big data is when you can't insert it into excel :) – RayofCommand Apr 29 '15 at 14:32

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