Data mining is the activity of discovering hidden knowledge, unexpected patterns and rules in large databases. Data mining is in turn linked to data warehousing, the central storage of data. The combination of data warehousing, decision support, and data mining indicates a fresh and totally different approach to information management. Knowledge discover in databases (KDD) and data warehousing point in the direction of a completely new use of information in an organization - that is, as a strategic source of new opportunities. The whole KDD process includes data selection, cleaning, coding, and process using different pattern recognition techniques. Setting up a data mining environment is not a trivial task, and the long term aim is to create a self-learning organization that makes optimal use of the information it generates.