Stock-index futures are financial contracts that enable traders to buy or sell an underlying stock index at a predetermined price on a future date. Synonyms for stock-index futures include equity futures, index futures, futures contracts, stock market futures, and market index futures. These financial instruments are used to hedge against market volatility and potential losses in the stock market. They are also used by investors and speculators to increase their exposure and potential profits in the market. Stock-index futures are highly liquid and can be traded through various financial exchanges. They are widely used by institutional investors, hedge funds, and other large financial institutions.