Stop profit is to stop profit, that is, to reach a certain profit on the liquidation.
The concept is on its way out.
For example, when you have an exposure and you sell, you buy, the price moves in your favor when the euro pair, you make a profit on the books, but only on the books, and if the market reverses at that point, you make less and less money and you end up losing money.
In order to cash in the book profit, it is necessary to close out the surplus.