This document provides an introduction to derivatives. It defines derivatives as financial instruments whose value is derived from an underlying asset. The three main types of derivatives discussed are forwards, futures, and options. Forwards are customized bilateral contracts to buy or sell an asset in the future at a predetermined price. Futures are standardized exchange-traded versions of forwards that have no counterparty risk. Daily mark-to-market settlements determine profits and losses on futures positions. Options provide the right but not the obligation to buy or sell an asset at a future date.