Forex trading means the simultaneous buying of one currency, and selling of another. The currency of one country is exchanged for that of another. The currencies are always traded in pairs such as US Dollar/Japanese Yen (USD/JPY), Euro/US Dollar (EUR/USD), Great Britain Pound/US Dollar (GBP/USD).More than 80% of daily forex trading involves major currencies like Australian Dollar (AUD), British Pound, Canadian Dollar (CAD), Japanese Yen, Swiss Franc (CHF), and the US Dollar. Forex Trading is not.