Margin in forex trading refers to the collateral that a trader needs to provide to open and maintain a trading position. It allows traders to control a larger position with a smaller amount of capital. Essentially, margin is the amount of money required to keep a trading position open, and it's a fundamental concept in leveraged trading.

Margin is money you need to have in your broker account to secure your open position. Different brokers require different amount of margin money to keep your positions open.

Margin in Forex is like trading with borrowed money. You put in a bit of your own cash, but the broker lends you the rest to make bigger trades. It's like a loan for trading, but be careful 'cause if your trade goes south, you still owe the broker back that borrowed money.