What is a market order? (Emirex.ee)

It is an order to buy or sell a coin immediately. This type of order guarantees that the order will be executed, but does not guarantee the execution price. A market order generally will execute at or near the current bid (for a sell order) or ask (for a buy order) price.

Note: However, it is important for investors to remember that the last-traded price is not necessarily the price at which a market order will be execute.