Market Order

An order type for immediate execution at current market prices. If willing buyers or sellers exist to take the other side, market orders are filled. Market orders are generally used when certainty of execution takes priority over price. Market orders expire after the market closes on the day they are entered. (Note: market orders can affect the price of the security being traded, sometimes significantly, adding uncertainty to the ultimate execution price.)

This is a definition, not a recommendation. Options carry risk and can expire worthless. See how the desk actually trades at TrueTrader.