Derivative is a financial instrument that derives its value from the value of some underlying asset. When the prices of commodities, currencies, securities, and interest rate are not fixed and keep on fluctuating, it becomes very necessary to hedge. Copy the link given below and paste it in new browser window to get more information on Derivatives and Hedging:- http://www.transtutors.com/homework-help/finance/derivaties-and-hedging.aspx