The seven most liquid
traded are traded against the US dollar with the first four pairs being the majors, followed by three commodity pairs. Other currency pairs are better known as the currency crosses, most popular crosses are those that include the euro, they are EUR/JPY, EUR/GBP and EUR/CHF.
The major currency pairs are:
EUR/USD
USD/JPY
USD/CHF
GBP/USD
The commodity currency pairs are:
AUD/USD
NZD/USD
USD/CAD