Forex (foreign exchange) is the global marketplace where one currency is exchanged for another. It is the largest and most liquid financial market in the world, trading around the clock across the major financial centres.
Why the market exists
Every time a company imports goods, a tourist buys local currency, or a fund hedges international exposure, currency changes hands. Those real-world flows — trade, investment, tourism, central-bank policy — are the foundation underneath every price you see on a chart.
How big and how liquid
Daily turnover is measured in trillions of dollars. For a retail trader, what matters is the practical consequence of that size: the major pairs are deeply liquid, spreads are tight, and you can usually enter and exit without moving the price. Liquidity is highest when London and New York overlap.
Who participates
The market is layered: central banks and governments, large commercial banks, corporations, hedge funds and asset managers, brokers, and finally retail traders. Retail flow is a small fraction of volume, which is why no honest educator promises you can 'beat the banks' — the realistic goal is a disciplined, risk-controlled process.
What you are actually trading
You never take delivery of physical currency. You trade the exchange rate between two currencies as a pair, profiting or losing from changes in that rate. The mechanics of pairs, pips and lots are covered in the next lessons.
Key takeaways
- Forex is the global market for exchanging one currency for another.
- It is the most liquid market in the world; majors have tight spreads.
- Real flows — trade, investment, policy — drive prices underneath the chart.
- Retail traders are a small part of the market; process beats prediction.