Hadoop is : open source software framework designed for distributing data-processing over inexpensive computers. data mining platform designed for storing and analyzing big data produced by web communications and transactions. high-speed platform used to analyze large data sets pre-configured hardware-software system designed for analyzing big data. NoSQL database technology that stores both data and procedures acting on the data as object

open-source software framework designed for distributing data-processing over inexpensive computers.

Explanation:

Hadoop refers to the collection of open-source software utilities which are important in facilitating the use of a network of several computers to solve big data.

It provides huge storage for different kinds of data, and the ability to handle concurrent tasks virtually. Therefore, the correct option is "open-source software framework designed for distributing data-processing over inexpensive computers".