What exactly is FOREX trading? Put simply, FOREX trading is the buying and selling of international currencies. Traditionally, participation in the FOREX market was confined to major banking and trading institutions. But in recent years, technological developments have opened up this once exclusive arena to smaller companies and even individuals by allowing them to trade currencies online. The world’s currency rates are not fixed. They follow a floating exchange rate and are always traded in pairs— EuroDollar, Dollar/Yen, etc. Most international transactions are exchanges of the world’s major currencies.