Derivatives are financial instruments whose value is based on an underlying asset such as commodities, interest rates, indices, or share prices. They are used to manage risk exposure in volatile markets through hedging and speculation. The main players in derivatives markets are hedgers who seek to reduce risk, arbitrageurs who profit from pricing discrepancies, and speculators who take positions based on their expectations of future price movements. Common types of derivatives include swaps, options, futures, and forwards, which allow parties to take long or short positions on assets.