Hadoop is something which lets you stores very big files. Even files bigger than what can be stored on one particular node or server can be store using Hadoop. It also lets you store many, many files.

In below video, Bill (Hadoop Specialist) explained very well "What is Hadoop and Big data".



Why do we need Hadoop or Big Data ?

To solve the data storage and processing challenges, organizations are starting to deploy large clusters of Apache Hadoop—a solution that utilizes parallel processing of large data sets commonly referred to as big data and creating multiple replications of the data to avoid any data loss. This is done across inexpensive, industry-standard servers that are used for both storing and processing the data.

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