ABSTRACTBig data is going to continue expanding during the next years as well as each data researcher will certainly have to manage a lot more quantity of data yearly. The information is most likely to be larger, diverse and also faster. Numerous technical challenges like applications and also visualizations are to be taken into consideration in future. This is just the survey paper which reveals the demand of big data and exactly how big business are taking rate of interest in it. The data mining methods can be used on big data to acquire some valuable info from big datasets. Therefore these two terms are not different rather they are combined with each other to get some helpful picture from the information. This paper provides the classification of privacy-preserving and characteristics of big data.Keywords: Big Data, classification, big data