The 8 major forex pairs are:
EUR/USD (Euro/US Dollar)
USD/JPY (US Dollar/Japanese Yen)
GBP/USD (British Pound/US Dollar)
AUD/USD (Australian Dollar/US Dollar)
USD/CAD (US Dollar/Canadian Dollar)
NZD/USD (New Zealand Dollar/US Dollar)
CHF/JPY (Swiss Franc/Japanese Yen)
EUR/CHF (Euro/Swiss Franc)
These are the most traded currencies in the world.