Leverage
Leverage means trading with borrowed money so a position is larger than your own funds, magnifying both gains and losses.
With 10x leverage, $1,000 of your own money controls a $10,000 position. A 5% move in your favour then makes 50% on your money; a 5% move against you loses half of it, and a 10% fall wipes the position out.
The exchange closes a leveraged position automatically when losses reach its margin, which is called liquidation. Higher leverage brings the liquidation price closer to the entry, so ordinary volatility can end the trade before any stop-loss does. See the leverage and liquidation guide.