Abstract: Data mining is used to extract meaningful information and to develop significant relationships among variables stored in large data set/data warehouse. In the case study reported in this paper, a data mining approach is applied to extract knowledge from a data set. Data mining is the process of discovering potentially useful, interesting, and previously unknown patterns from a large collection of data. Today, Data mining helps different organization focus on the information in the data they have collected about the behaviour of their customerís. From last few years, research in data mining continues growing in various fields of organization such as Statistics, Machine Learning, Artificial Intelligence, Pattern Recognition, business, education, medical, scientific etc. In this paper discusses the concept of data mining, important issues and applications.

Keywords: Data mining, Data Base, Information, Association rules; Clustering, KDD.