Currency pair – is a form of relative value of one currency to another one. Thus, the value of a currency unit is measured via its correlation to the value of another currency unit. The names of currency pairs are written in generally accepted combinations, for example EURUSD, EURSGD, GBPUSD, GBPCHF, AUDUSD, UADCHF, USDJPY and so on.
Any deal with currency pair is a purchase of one currency pair with sale of another one at the same time. For example, buying EURUSD, a trader buys EUR and sells USD at the same time.