Today it is the competitive, fast business world most organizations start with data processing system that support transaction processing and evolve to management information system which support tactical and strategic level decision making .The opinion is that computer based systems are very valuable for transaction processing and support of operational level decision making. Computers play an important role in providing significant support for tactical and strategic level decision making especially for unstructured and unanticipated decisions. In the past few years a new type of system called Decision Support System has gained a great deal of popularity in the information system. We are sure that for some characteristics of organizations decision support system are very useful. Decision Support System supports individual decision making - a major component of managerial work. DSS is the primary means by which businesses can gain competitive advantage through analyzing and using the information stored in their computerized systems. Decision making process are playing important role in the Global Business Environment. Decision Support System supports not only for the decision making but also communication among individuals.