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Explain Hadoop?
Hadoop is framework for distributed processing of large datasets across the clusters of comodity computers.

What HDFS stands for.

HDFS stands for Hadoop Distributed File System. It is set of client and server services that allow an organization to organize many distributed SMB file shares into a distributed file system using Microsoft windows servers.

What does commodity computer means

Comodity computer means inexpensive hardwares. They are not cheap in Quality.A commodity computer is a standard-issue PC that is widely available for purchase.