It’s like a mortgage. An apartment costs $100,000, you put in $20,000, and the bank adds the rest. The apartment’s price goes up 10%, which is $10,000. That’s half of your $20,000, even though the apartment itself only rose by a tenth.
A broker works the same way. Leverage is written as “10×” or “1:10”. Example: you have $100, leverage is 10, the trade is $1,000. The price rises 2% — that’s $20 of profit, a fifth of your money. Without leverage, the same 2% would give you $2.