Apache Hadoop is a collection of open-source software utilities that facilitates using a network of many computers to solve problems involving massive amounts of data and computation. Use of Hadoop is closely attached to the term Big Data.
Open Source: Hadoop is open-source, which means it is free to use.
Highly Scalable: Hadoop is scalable over various nodes.
Fault Tolerance: Due to clustering, node failures are tolerable.
High Availability: The same data is available over clusters of node
Cost-Effective: Inexpensive commodity hardwares make it very affordable
Flexibility: It is flexible over various Operating Systems
Easy to Use: It requires less coding to use
Data Locality: Data is available on client systems instead of the cloud