Foreign exchange (FX); commonly refers to foreign currency trading, especially retail margin FX trading.
最近、友人がFXで取引を始めたと言っていた。
A friend recently told me they started trading FX.
FX市場は24時間動いているので、夜間でも為替変動に注意が必要だ。
The FX market operates 24 hours, so you need to watch currency fluctuations even at night.
為替相場の変動でFXで大きな損失を出すこともある。
Large losses can occur in FX trading due to exchange rate fluctuations.