In this review paper, the concept of Big Data will be presented. In the beginning, a definition of Big Data its features will be reviewed. Then, the main or the most important issue met in big data management with the steps for data processing will be described. As well, the technologies used with Big Data management will be reviewed. Also, the most important visualization methods and techniques for analyzing big data will be listed and explained. Lastly, what challenges the Big Data is faced for privacy will be described and what you need to design a privacy model