Slippage – The difference between the expected execution price of a trade and the actual fill price. Slippage occurs when the market moves between order submission and execution or when there’s insufficient volume at the requested price. It can be positive (better price) or negative (worse price). For example, a large market order in volatile conditions may “slip” through several ticks before filling. Forex robots often account for slippage by setting price tolerances or using limit orders to minimize unwanted execution gaps.

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