Abbreviation of "foreign exchange" (外国為替). Refers to exchange or transactions of currencies between countries; used in finance and trade contexts.
最近、外為市場で円安が続いている。
Recently, the yen has been weakening in the foreign-exchange market.
銀行は外為取引の手数料を改定した。
The bank revised its fees for foreign-exchange transactions.
輸入業者は外為相場の変動を注視している。
Importers are watching fluctuations in the foreign-exchange rates.