A currency pair is the stated value of a currency in comparison to another currency. This concept is used in the foreign exchange market to buy and sell currencies. In a pairing, the first currency stated is the base currency, while the second currency is the quote currency. In each pairing, the amount stated for the quote currency is the amount needed to buy one unit of the base currency. Thus, the assumption is that the quote currency is being sold in order to buy the base currency.
For example, in the 1 GBP / 1.5 USD currency pair, it takes 1.5 U.S. dollars to buy one British pound.
The most frequently traded currency pairs are referred to as the majors. These currencies are the Australian dollar, Canadian dollar, euro, Japanese yen, New Zealand dollar, pound sterling, Swiss franc, and U.S. dollar.