What is a stop-loss?
A stop-loss is an order designed to reduce losses if price drops to a level you choose. You decide your invalidation point before the trade gets emotional. If price reaches that level, your trading app can automatically try to sell instead of waiting for you to react manually.
Buy at $100, risk to $92
If you buy an asset at $100 and set a stop at $92, you are saying the trade no longer looks acceptable below that level.
It defines risk in advance
Without a stop plan, many traders hold and hope. A stop-loss forces a decision rule before stress takes over.
It does not guarantee your exact exit
Fast markets, gaps, and thin liquidity can cause slippage. A stop is risk control, not a promise.