Derivatives have become extremely important in finance over the last forty years. They derive their value from an underlying asset like a stock or commodity. The most commonly used derivatives are futures contracts, options contracts, and forward contracts. Futures and options are generally traded on exchanges while forwards are over-the-counter. Exchanges ensure standardized contracts and trading while over-the-counter allows customization but with dispute risk. Traders use derivatives for hedging to protect asset values, speculation to profit from price movements, or arbitrage to exploit temporary price mismatches. Derivatives require understanding to use properly given associated risks.