Forex is where currencies trade against each other, and it runs 24 hours a day across global financial centers

The foreign exchange market — called forex or FX — is where one country's currency trades for another's. When you exchange dollars for euros at an airport, you are using forex. When a U.S. company pays a supplier in Japan, forex happens. The market has no single physical location. Instead, banks, brokers, and traders buy and sell currencies over the phone and through computer networks, mostly between major cities: London, New York, Tokyo, and Singapore.

Forex is the largest financial market in the world by volume. Trillions of dollars worth of currency change hands every day. Unlike the stock market, which closes at the end of each trading day, forex runs continuously — when New York closes, Tokyo opens. This means prices move around the clock, and traders can enter and exit positions at almost any time.

Most people never trade forex directly. But forex affects your life constantly. When the dollar strengthens, imported goods cost more. When it weakens, U.S. exports become cheaper abroad. Interest rates, inflation, and political events all move currency prices. Understanding how forex works helps you see why exchange rates change and what those changes mean for your money.

Key Takeaways

  • Forex is the global market where currencies trade 24 hours a day, five days a week, across multiple time zones and financial centers.
  • Currency pairs are quoted as two currencies — the base currency and the quote currency — and the price shows how much of the quote currency you need to buy one unit of the base currency.
  • Forex prices move based on interest rates, inflation, economic growth, political events, and supply and demand for each currency.
  • Most people encounter forex indirectly through travel, international purchases, or investments, rather than by trading currencies themselves.
  • Central banks and large institutions dominate forex trading, but retail traders can also participate through brokers and trading platforms.

How currency pairs work in forex

Forex always quotes currencies in pairs. The first currency is the base currency, and the second is the quote currency. When you see EUR/USD = 1.10, it means one euro equals 1.10 U.S. dollars. To buy euros, you sell dollars. To sell euros, you buy dollars. Every trade involves selling one currency and buying another at the same time.

The price you see is the exchange rate. It tells you exactly how much of the quote currency you need to get one unit of the base currency. If GBP/USD is 1.27, one British pound costs 1.27 dollars. If the rate moves to 1.28, the pound got stronger — it now costs more dollars. If it drops to 1.26, the pound got weaker.

Major pairs involve the U.S. dollar paired with other large currencies: EUR/USD, GBP/USD, USD/JPY, and USD/CHF. These pairs have the most trading volume and the tightest spreads — the difference between the buy and sell price. Exotic pairs, like USD/THB (Thai baht), have less volume and wider spreads, so they cost more to trade.

What moves forex prices

Interest rates are the biggest driver of forex prices. When the Federal Reserve raises rates, the dollar usually strengthens because investors want to hold dollars to earn higher returns. When rates fall, the dollar often weakens. Other central banks — the European Central Bank, Bank of Japan, Bank of England — move their rates too, and those decisions ripple through forex when ready.

Economic data moves prices in real time. When the U.S. reports stronger-than-expected job growth, the dollar often rises. Weak inflation data can push the dollar down. Traders watch economic calendars for releases like employment reports, GDP growth, and consumer spending. The moment data hits, prices can swing in seconds.

Political events and uncertainty also shift currencies. Elections, trade disputes, wars, and policy changes all affect how investors view a country's future. A country with political instability often sees its currency weaken as investors move money elsewhere. Safe-haven currencies like the Swiss franc and Japanese yen often strengthen during global uncertainty.

Supply and demand work the same way in forex as in any market. If many traders want to buy euros and few want to sell, the euro price rises. If selling pressure builds, the price falls. Large flows — like a foreign company buying U.S. assets or a country's central bank intervening — can move prices significantly.

Who trades forex and why

Central banks are the largest forex participants. They buy and sell currencies to manage their country's exchange rate, control inflation, and influence economic policy. The Federal Reserve, European Central Bank, and Bank of Japan move markets with their actions and statements.

International businesses trade forex to pay suppliers, collect revenue, and manage currency risk. A U.S. manufacturer that buys parts from Germany needs euros. A Japanese automaker that sells cars in America needs dollars. These companies use forex to convert currencies at the rates they need.

Investment firms and hedge funds trade forex to profit from price movements and to hedge — protect — their other investments. A fund that owns European stocks might sell euros to reduce risk if it thinks the euro will weaken.

Retail traders — individuals — also trade forex through brokers and online platforms. They aim to profit from price swings, though most lose money because forex is volatile and leverage — borrowed money — amplifies both gains and losses. Retail trading makes up a small fraction of total forex volume.

The difference between forex and stocks

Forex and stock markets operate very differently. The stock market is centralized — all U.S. stocks trade on exchanges like the NYSE or NASDAQ with set hours. Forex is decentralized — it runs over-the-counter through banks and brokers with no central exchange or fixed hours. Forex trades 24 hours a day, five days a week. Stocks trade during market hours, roughly 9:30 a.m. to 4 p.m. Eastern time.

Stock prices reflect a company's earnings, growth, and competitive position. Currency prices reflect a country's economic health, interest rates, and political stability. Stocks can be held indefinitely. Forex trades typically close within days or weeks, though some traders hold positions longer. Stocks have bid-ask spreads measured in cents. Forex spreads are measured in fractions of a cent, or pips — the smallest price move in a currency pair.

Leverage is also different. Stock brokers typically allow 2:1 leverage — you can borrow one dollar for every dollar you own. Forex brokers often allow 50:1 or higher leverage, which means you can control large positions with small amounts of money. This amplifies both profits and losses, making forex riskier for retail traders.

How exchange rates affect everyday life

When you travel abroad, you exchange dollars for the local currency at an airport or bank. The rate you get depends on forex prices that day. If the dollar is weak, your money buys less. If it is strong, your money goes further. Hotels, restaurants, and shops in tourist areas often quote prices in dollars, but the rate they offer is usually worse than the market rate.

When you buy imported goods — clothes, electronics, cars — the price reflects the exchange rate at the time the goods were ordered or shipped. A weak dollar makes imports more expensive. A strong dollar makes them cheaper. Companies that import goods pass these costs to consumers.

If you have investments abroad or own foreign stocks, forex affects your returns. A U.S. investor who owns European stocks makes money if the stocks rise and if the euro strengthens against the dollar. If the euro weakens, the dollar value of those stocks falls even if the stock price stays the same.

Frequently Asked Questions

Can I trade forex with a small amount of money?

Yes, many forex brokers allow you to open an account with $100 or less. However, small accounts combined with high leverage can lead to rapid losses. A 2% move against your position can wipe out your entire account if you use maximum leverage. Most successful traders start small and learn before risking significant money.

What time of day is best for forex trading?

The most active trading happens during overlapping hours when two major markets are open at the same time. The London-New York overlap (8 a.m. to noon Eastern time) and the Tokyo-London overlap (2 a.m. to 4 a.m. Eastern time) see the highest volume and tightest spreads. Slower times mean wider spreads and larger price gaps.

Why do exchange rates change so quickly?

Forex prices move when ready because the market reacts to new information in real time. Economic data, central bank statements, and news events can shift trader expectations in seconds. With trillions of dollars trading daily, even small shifts in demand cause visible price changes. Computer algorithms also execute trades in milliseconds, amplifying price swings.

Is forex trading the same as currency speculation?

Forex trading includes both hedging — protecting against currency risk — and speculation. A company hedging locks in an exchange rate to protect profit margins. A speculator bets that a currency will move in a certain direction to profit from the move. Most retail forex activity is speculation, which carries high risk of loss.

How does forex relate to inflation and interest rates?

Higher interest rates make a currency more attractive because investors earn more by holding it. Central banks raise rates to fight inflation, which typically strengthens the currency. Lower rates reduce the appeal of holding that currency, so it often weakens. Inflation itself also matters — high inflation erodes purchasing power, which can weaken a currency over time.