Leverage refers to how much of the broker’s money you can use combined with your own. For example; if leverage is 1:20, every £100 you put in, the broker will loan you another £2000. Leverage magnifies both your profits and your losses. Margin refers to how much you need to keep in your account to avoid a “margin call”. Hopefully you won’t encounter this issue but it’s when you don’t have enough money in your account to cover your open positions.