Forex, short for foreign exchange, is the market where currencies are traded. When you exchange U.S. dollars for euros before a trip to Europe, you're participating in the forex market. When a Japanese company converts yen to dollars to buy American goods, that's forex too. The difference for traders is that you don't need to travel or buy goods. You trade currencies to profit from changes in exchange rates.

The scale of forex

The forex market is the largest financial market in the world by a wide margin. Daily trading volume exceeds $7 trillion, dwarfing the combined volume of global stock markets. This enormous liquidity means tight spreads, fast execution, and the ability to enter and exit large positions without significantly moving the market.

Forex is also decentralized. There is no single exchange where all currency trading happens. Transactions occur across a global network of banks, brokerages, and trading platforms, 24 hours a day, five days a week (Sunday evening to Friday evening, U.S. Eastern Time).

How currency trading works

Currencies trade in pairs. You're always buying one currency while simultaneously selling another. The EUR/USD pair, for example, measures how many U.S. dollars one euro is worth. If EUR/USD is quoted at 1.0850, one euro costs $1.0850.

If you believe the euro will strengthen against the dollar, you buy EUR/USD (going long). If the euro rises to 1.1000, you sell for a profit. If you believe the euro will weaken, you sell EUR/USD (going short) and profit if the exchange rate drops.

Every forex trade involves this two-sided structure. When you're bullish on the euro, you're simultaneously bearish on the dollar. This creates opportunities because you can choose to trade the pair where you have the strongest conviction about the direction of one or both currencies.

Who participates in forex

Central banks trade forex to manage their currency's value and implement monetary policy. Commercial banks handle massive volumes of currency conversion for international business. Hedge funds and institutional traders speculate on currency movements. Retail traders participate through brokerages and trading platforms.

As a retail trader, you're entering the same market as these larger participants. The advantage is that forex liquidity is deep enough that retail order flow has minimal impact on prices. The disadvantage is that currency prices are influenced by forces (central bank decisions, geopolitical developments, global capital flows) that can be difficult to anticipate.

Why traders choose forex

Forex attracts traders for several reasons. The 24-hour trading window means you can trade around your schedule regardless of timezone. The high liquidity keeps spreads tight and execution fast. The availability of leverage lets you control larger positions with less capital (though leverage amplifies losses as much as gains).

Currency markets also respond to macroeconomic events in relatively predictable ways. Interest rate differentials, inflation data, and trade balances drive exchange rates through well-understood mechanisms. For traders who enjoy macro analysis, forex offers a direct way to trade their views.