Derivatives are financial instruments whose value is based on an underlying asset such as a stock, bond, commodity, or currency. There are three main types of derivatives: futures and forwards, which are contracts to buy or sell an asset on a future date; options, which give the owner the right but not obligation to buy or sell an asset; and swaps, which involve exchanging cash flows of one party's financial instrument for those of another party. Derivatives offer benefits like speculation, hedging risk, leverage, and flexibility, but also carry risks such as credit risk, potential for crimes, and impacting the leverage of an economy's debt.