WHAT IS MARGIN/MARGIN REQUIREMENT?  

Margin is the money you need to set aside from your balance to start a new forex trade. It is not an extra cost or a deduction from your account - it is just a part of your balance that is reserved for your new trade. You have to make sure you have enough money in your account to avoid a margin call, which means your trade will be closed automatically if you lose too much.  https://www.thinkmarkets.com/en/support/lega-and-regulation/margin-call-policy