Demo Forex account is essentially a virtual trading platform where you can buy and sell various currencies without risking real money. In providing this service, Forex brokers replicate live online Forex trading within a test environment where no trade actually gets sent to the market. There is a slight caveat to this. In a true ECN market environment, trades will not necessarily be executed at the requested price you see in the electronic trading platform. This is because there is always a time lag between the time you trigger your trade, and the moment it actually reaches the bank on the other side of your Forex trade. In live trading, this is referred to as slippage, which may be favorable to you or go against you. This is fully expected, and under normal market conditions, won't be noticeable. Over the long-term, and when trading with a true ECN broker, slippage is likely to be in your favor and may help you accumulate substantial savings.