Margin refers to the amount of money that a trader must deposit in order to open a position in a market. It is a percentage of the total value of the trade and is typically used as a measure of risk. For example, if a trader wants to buy a stock and the margin requirement is 10%, they would need to deposit 10% of the value of the stock as collateral.

Leverage, on the other hand, refers to the ability to control a large number of assets using a relatively small amount of capital. In trading, leverage can be provided by a broker, allowing traders to enter larger trades than they would be able to otherwise. For example, if a trader has $1,000 in their account and is trading on leverage of 10:1, they would be able to enter trades worth up to $10,000. Leverage is a double-edged sword, it can increase gains as well as losses.

In short, the margin is the collateral a trader needs to post to open a trade, while leverage is a tool that allows a trader to trade with more capital than they have in their account.