Every time someone swaps euros for dollars — a tourist, a company, a bank — they’re using the foreign exchange market. It’s the plumbing that lets money move between countries, and it’s enormous.
The biggest market there is
FX (short for foreign exchange, also called forex) is where currencies are traded for one another. By volume it dwarfs every other market — trillions of dollars change hands every day, far more than all the world’s stock markets combined. It runs around the clock, five days a week, as trading passes from Asia to Europe to the Americas.
You always trade a pair
Here’s the twist that trips people up: you can’t buy a currency in isolation. To buy euros, you must sell something else — dollars, say. So FX is always quoted as a pair: EUR/USD, GBP/JPY, and so on. Buying one currency is selling the other. (The next lesson unpacks how to read those pairs.)
Who uses it, and why
- Travellers & shoppers — changing money to spend abroad.
- Companies — a firm selling goods overseas gets paid in a foreign currency and must convert it.
- Investors — buying foreign stocks or bonds means buying foreign currency too.
- Banks & central banks — by far the biggest players, moving money and managing reserves.
- Speculators — betting on which way a rate will move (a small slice of the volume).
Most FX isn’t speculation — it’s the by-product of real economic activity crossing borders.
The takeaway
Foreign exchange is the global market for swapping one currency for another — the largest, most liquid market in the world, open 24/5. You always trade currencies in pairs, and most activity comes from real cross-border business, not betting. (This is education, not investment advice.)