Forex (FX) Definition: Forex, short for foreign exchange, is the global market where one currency is exchanged for another at a floating price called the exchange rate. It is the largest financial market in the world, with average turnover of $7.5 trillion per day in April 2022, and it trades over the counter 24 hours a day, five days a week.
What Is Forex?
Every time a company pays a foreign supplier, a tourist buys euros or a pension fund purchases Japanese bonds, someone has to swap one currency for another. The forex market is the network where those swaps happen. Most of its volume, however, comes from banks, funds and traders who never need the foreign cash and simply bet on price changes.
Unlike stocks, forex has no central exchange. It is an over-the-counter market: banks, brokers and electronic platforms quote prices to each other directly. That is why trading follows the sun, opening in Sydney on Monday morning, passing through Tokyo and London, and closing in New York on Friday afternoon.
Floating exchange rates are younger than many traders assume. Until August 1971, the Bretton Woods system pegged major currencies to the US dollar, which was itself convertible into gold. When President Nixon suspended that convertibility, rates began to float, and the modern forex market grew from there. The US dollar remains its anchor: the BIS Triennial Survey found it on one side of 88% of all trades in April 2022, ahead of the euro at about 31% and the yen at 17%.
How Does Forex Trading Work?
With the basics in place, the mechanics come down to four ideas: pairs, pips, lots and margin. A price is always quoted as a pair, such as EUR/USD 1.1000, meaning one euro costs 1.10 dollars. Buying the pair means buying euros and selling dollars at the same time. A pip is the fourth decimal place (0.0001) for most pairs, and a standard lot is 100,000 units of the first currency.
Suppose you buy one standard lot of EUR/USD at 1.1000. The position controls €100,000, worth $110,000. With 100:1 leverage, your broker asks for $1,100 of margin.
Each pip is worth $10, so a rise to 1.1050 (50 pips) earns $500, or 45% on the margin. A fall to 1.0950 loses the same $500, which shows why leverage turns a 0.45% currency move into a large swing in your account.
Your cost of trading is mostly the bid-ask spread, the gap between the price at which you can sell and the price at which you can buy. On heavily traded pairs the spread can be a fraction of a pip. On thinly traded currencies it widens, because dealers take more risk holding them.
Types of Forex Markets
- Spot: currencies change hands at the current rate, settling in two business days. Spot made up 28% of turnover in April 2022.
- FX swaps: two parties exchange currencies now and reverse the trade later at a pre-agreed rate. Banks use swaps to manage funding, and they formed 51% of turnover.
- Outright forwards: a single exchange at a fixed rate on a future date, used by companies to lock in costs. They made up 15%.
- Futures, options and CFDs: derivatives that give exposure to exchange rates without delivering the currency, which is how most retail traders access forex.
Forex vs. Stock Market
| Forex | Stock market | |
|---|---|---|
| Structure | Decentralised, over the counter | Centralised exchanges |
| Trading hours | 24 hours, Monday to Friday | Set exchange hours |
| What you trade | One currency against another | Shares of a single company |
| Main price drivers | Interest rates, inflation, trade, policy | Earnings, growth, valuation |
| Typical retail leverage | High, often 30:1 or more | Low, often 2:1 to 5:1 |
Why Is Forex Important for Traders?
Currencies price the relative health of entire economies, so forex reacts first to shifts in interest rates and growth. When one central bank raises rates faster than another, money flows toward the higher yield and its currency rises. That link makes forex the market where macro news shows up most directly, and it is why stock and crypto traders watch the US Dollar Index even if they never trade a pair.
Deep liquidity does not remove risk. On 15 January 2015, the Swiss National Bank scrapped its floor of 1.20 francs per euro without warning, and the franc jumped about 30% within minutes. Stop-loss orders could not be filled at their set prices, broker FXCM was left with roughly $225 million in negative client balances, and Alpari UK went into insolvency.
Leverage is the second trap. Because daily moves in major pairs are often below 1%, retail brokers offer high leverage to make those moves meaningful. The same leverage means a routine move against you can wipe out the margin before your analysis has time to be proven right.
Key Takeaways
- Forex is the decentralised, over-the-counter market where currencies are exchanged, and it runs 24 hours a day from Monday in Sydney to Friday in New York.
- Every forex price is a pair, so buying one currency always means selling another, and the US dollar sits on one side of most trades.
- Pips, lots and margin determine the size of a position, and leverage converts small currency moves into large gains or losses.
- Interest rate differences between countries are the main force behind exchange rates, which makes forex the most direct reflection of macro news.
- High liquidity keeps costs low in normal conditions but does not protect against sudden policy shocks that can gap prices past stop-loss levels.
Is forex trading legal?
Yes, in most countries, but brokers must be licensed where they serve clients, and some regulators cap the leverage offered to retail traders. Always check that a broker is regulated in your jurisdiction.
Why is forex closed on weekends?
The banks that form the core of the market stop dealing from Friday's New York close until Monday morning in Sydney. Prices can still gap at the Monday open if news breaks over the weekend.
Does high liquidity mean forex is low risk?
No. Liquidity keeps spreads tight in normal conditions, but leverage magnifies small moves, and rare events such as the 2015 Swiss franc shock can move a pair 30% in minutes.
What moves exchange rates the most?
Interest rate expectations are the biggest single driver, because capital flows toward currencies that pay higher real returns. Inflation data, jobs reports, trade flows and risk sentiment also matter.
