Trading mechanics
An order is a request to trade; the resulting price and quantity depend on order type, available market conditions, and platform rules.
Market orders request execution at available prices, while pending orders depend on their trigger and order rules. An order may be filled, partially filled, rejected, or cancelled according to the applicable conditions. MetaTrader 5 records order, deal, and position information in its trade and history views.
The difference between a requested price and the resulting price is often called slippage. It can be favourable or unfavourable. Stop instructions can help define an intended exit level, but a market gap or lack of available volume can mean the resulting execution differs from that level.