The OANDA Trade platform supports margin trading, which means you can enter into positions larger than your account balance. One advantage of margin-based trading is that you can leverage the funds in your account and potentially generate large profits relative to the amount invested. The downside is that you have an equal opportunity to incur significant losses in your account. It is a good practice to utilize stop loss orders to limit potential losses when utilizing leverage. Stop loss orders are not guaranteed; gaps in market pricing may cause your stop loss orders to be filled at a less advantageous price. The order types page provides more detail on stop losses and other orders.