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A very large size of digital data has been generated in the world in view of the technical and technological development in the recent decade. As a result, a notion of "big data" has emerged; nowadays, it has become an important topic that is broadly discussed in newspaper and journal articles, blogs and etc. Alongside with creating new prospects for the modern society, "Big data" has also brought about some problems for researchers. Unlike the mass media and the business sector, the notion of "big data" is reviewed as a scientific-research object in this article, and a short comment on "big data" concept is provided. The main factors underlying its development as a research direction are presented. Moreover, current scientific and theoretical issues in the focus of researchers are also analyzed.

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