A derivative is a financial instrument whose value is derived from the value of an underlying asset. Derivatives include forwards, futures, options, and swaps. Forwards and swaps are traded over-the-counter (OTC), while futures and options are traded on exchanges. Options give the holder the right but not obligation to buy or sell the underlying asset. Swaps involve exchanging cash flows of one asset for another at periodic intervals. Derivatives allow investors to hedge risk or speculate on price movements of the underlying asset.