When you execute a Forex trade, you are purchasing an amount of currency, termed a lot. The amount of currency in one lot depends upon the type of account you have. In a standard account, one lot is usually equal to U.S. $100,000; in a mini account, one lot is $10,000.
But Forex trading accounts are leveraged, which means you dont have to own that expensive lot of currency; you just have to control it, and if you do, any profit it earns is yours. To obtain the right to control a lot of currency, you put up a much smaller amount of money in a sort of rental agreement called a margin deposit. In a standard account, to control that U.S. $100,000, you must put up $1,000 of your own money; in a mini account, to control $10,000, you need to put up $100.
The leverage influences the amount of profit you earn, as well. In a standard account, one pip of a currency pair that has the U.S. dollar as the base is equal to U.S. $10; in a mini account, one pip equals to $1. This means that, should you correctly forecast the movement of the market and execute a trade that earns you two hundred pips (not an unrealistic goal), if you have a standard account, your profit will be...