What is Keyword Context in Hadoop programming world?

What exactly is this keyword Context in Hadoop MapReduce world in new API terms?

Its extensively used to write output pairs out of Maps and Reduce, however I am not sure if it can be used somewhere else and what’s exactly happening whenever I use context. Is it a Iterator with different name?

What is relation between Class Mapper.Context, Class Reducer.Context and Job.Context?

Can someone please explain this starting with Layman’s terms and then going in detail. Not able understand much from Hadoop API documentations.

Thanks for your time and help.

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