# Open Order
Execution of orders is based on the bid and ask prices between buyers and sellers, and occurs sequentially for corresponding orders, starting with the orders placed first. The entire order quantity may be executed at once, but depending on order conditions, it may be partially executed or remain as an unfilled order. The main reasons for unexecuted orders are as follows:
1. **When there is no matching order price :**
Buy orders are prioritized by executing the highest bid first, while sell orders are prioritized by executing the lowest ask first.
If there is no matching order price between buy and sell orders, the order will not be executed.
2. **When there are many preceding orders :**
When orders are placed at the same price, execution is based on the order of submission. Since earlier orders are prioritized based on time, if preceding orders are not fully executed, your order may remain unfilled.
*🌟 Unexecuted orders will remain until the user cancels them directly. However, in certain cases, such as server maintenance, orders may be canceled to protect users' assets. Notifications of such cancellations will be announced before the server maintenance begins.*
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