A trading session is the period when a major financial centre is most active and market participation is concentrated.
What it means
A trading session is the period when a major financial centre is most active and market participation is concentrated.
Full: In practical terms, a trading session describes the main active window for a major region such as Asia, London, or New York. It is not just a time label. It often reflects a different mix of liquidity, volatility, participation, and event sensitivity. That is why the same market can feel slower, faster, thinner, or more reactive depending on which session is active.
Why it matters in live markets
In real markets, trading sessions help explain why conditions are not constant through the day. As major financial centres open, overlap, and close, quoted prices, spreads, market depth, and execution conditions can all change. Understanding this term helps you interpret changes in price behaviour more accurately and avoid assuming that every hour of the trading day behaves the same way.
Key points
- Trading sessions are active market periods linked to major financial centres.
- Different sessions can bring different liquidity and volatility conditions.
- Overlap periods often increase activity because more participants are active at the same time.
Example
A major currency pair may feel relatively calm during one session, then become more active and responsive when London opens or when London and New York overlap. The instrument is the same, but the surrounding market conditions have changed.
Related glossary terms
Session Open, Liquidity, Volatility, Slippage, Spread
Where you will see it
You will usually encounter this concept in forex education, market commentary, economic calendar planning, and discussions around Asia, London, and New York market hours. If you are comparing conditions across instruments, note that behaviour can differ by market, by session, and by the broader event backdrop.