Market Order

Market Order - An immediate buy or sell order executed at the current market price. MT4/MT5 have two market order types: Buy (market) and Sell (market). When submitted, these orders fill at the best available price (there can be slippage). In MQL, OrderSend() with action TRADE_ACTION_DEAL is used for market orders. A market order appears in the chart (and Terminal) until it’s closed.