Derivatives are financial instruments whose value is derived from an underlying asset. The three main types of derivatives are forwards, futures, and options. Forwards are customized contracts traded over-the-counter, while futures are standardized contracts traded on an exchange. Options give the holder the right but not obligation to buy or sell the underlying asset. Swaps involve exchanging cash flows of one party's financial instrument for those of another party. Derivatives allow parties to manage financial risks and speculate in the market.