Currency Pair, Currency Pairs
Forex trading involves the simultaneous buying of one currency and selling another. The currencies involved in a single trade form a currency pair. The first currency quoted in a currency pair is called the base currency, while the second currency is called the quote currency or the counter currency. When an exchange rate is quoted, it is always expressed as the number of units of the counter currency needed to buy one unit of the base currency.
While there are several currency pairs, the top four currency pairs that account for 70% of the total daily trade are: