Data Mining or KDD (Knowledge Discovery in Database) is related with finding hidden facts and knowledge from the large databases or data warehouses. DM i.e. Data Mining is the technique to find out the hidden facts from the large amounts of data. From the historic data, the authors derive knowledge. Data mining is important aid for decision making in organizations. Data mining task is the automatic or semi-automatic analysis of large quantities of data to extract previously unknown interesting patterns from the data store.