The definition of a decision support system is any system of input available to help a person or an organization make decisions.
An example of a decision support system is a group of computers that helps a business run numbers to analyze so that the business can make the best financial decisions.
An example of a decision support system is a group of friends who provide information and emotional support to a person who is going through a divorce.
An information and planning system that provides the ability to interrogate computers on an ad hoc basis, analyze information and predict the impact of decisions before they are made.An Integrated SolutionDatabase management systems (DBMSs) let you select data and derive information for reporting and analysis. Spreadsheets and modeling programs provide both analysis and "what if?" planning. However, any single application that supports decision making is not a decision support system (DSS). A DSS is a cohesive and integrated set of programs that share data and information. A DSS might also retrieve industry data from external sources that can be compared and used for historical and statistical purposes. An integrated DSS directly impacts management decision-making. See EIS, OLAP and decision automation.