The Market order type will execute immediately at the current price offered in the market. Execution is guaranteed, but the price at which your Bitcoins will be filled is not. An indicative price is displayed with this order type option.
The Limit order type will only execute at the Price you specify or better, but may not be filled immediately, or at all. Price is guaranteed, however your order will remain open until filled. The exact price you will pay is displayed with this order type option. Your limit orders remain until manually cancelled.
An Immediate Or Cancel (IOC) order requires all or part of the order to be executed immediately or it will be cancelled. When an IOC order is placed to the system, our order engine will attempt to execute it according to the order specifications. If the order cannot be executed or can only be partially matched, the system will automatically cancel the order or the unexecuted part of it.