What is MapReduce?

MapReduce is used in distributed computing environment.  It maps various data points. After computation and logical operations reduces , and results are produced.
I guess confused?
In olden times in Athens kingdom (or somewhere), the population count is taken by adding data captured on bottom-up  approach.  The data is mapped and compiled and finally census is announced.
Let us say there 10 towns in each city, at there 10 cities in the country. Announcement will go to start the work (Query is launched, 100 people are deployed to collect the data. Data )
1. Data is collected city level  (One Data Server is each per city)
2. At town level we will get data (some of data of all cities)
3. At country level we can data, by combining data of all towns

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