Derivatives are financial contracts whose value is based on an underlying asset. Common derivatives include futures contracts and options. An options contract gives the buyer the right to purchase an asset at a set price, while a futures contract requires the buyer and seller to exchange an asset at a predetermined price on a future date. Both futures and options allow corporations and investors to hedge against unfavorable price movements in the underlying asset. Futures contracts in particular help lock in prices for transactions that corporations will need to make in the future.