The foreign exchange (FX) market operates 24 hours a day, making it nearly impossible for a single trader to track every market movement and respond immediately at all times. In order to devise an effective and time‐efficient investment strategy, it is important to understand how much liquidity there is around the clock to maximize the number of trading opportunities during a trader's own market hours. This chapter outlines the typical trading activity of major currency pairs in different time zones to see when they are the most volatile. The FX market is broken into three primary trading sessions, namely Asian session, U.S. Session and European session. Most currencies in the FX market are quoted with U.S. dollar as the base and the primary instrument traded before a cross. The FX markets tend to be most active when the hours of the world's two largest trading centers overlap.