Slippage is when your order is executed at a different price to the one requested. It can be positive or negative, meaning your order can be executed at either a more favourable price, or a worse one.
Market prices can change quickly, especially in periods of high volatility like during economic data releases. Slippage is more likely to occur during these periods, due to delays between your order being placed, processed, and executed.
One way to protect your trades against slippage is to make use of limit orders.
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