Hadoop is an open-source framework that allows to store and process big data in a distributed environment across clusters of computers using simple programming models. It is designed to scale up from single servers to thousands of machines, each offering local computation and storage.

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1  What Comes Under Big Data? Big data involves the data produced by different devices and applications. 
2  Transport Data : Transport data includes model, capacity, distance and availability of a vehicle. 
3  Social Media Data : Social media such as Facebook and Twitter hold information and the views posted by millions of people across the globe. 
4  Given below are some of the fields that come under the umbrella of Big Data. 
5  Search Engine Data : Search engines retrieve lots of data from different databases. 
6  Stock Exchange Data : The stock exchange data holds information about the ‘buy’ and ‘sell’ decisions made on a share of different companies made by the customers. 
7  Black Box Data : It is a component of helicopter, airplanes, and jets, etc. 
8  Power Grid Data : The power grid data holds information consumed by a particular node with respect to a base station. 
9  It captures voices of the flight crew, recordings of microphones and earphones, and the performance information of the aircraft.