What Is Forex? A Beginner's Guide to Currency Trading

The foreign exchange market, usually shortened to "forex" or "FX", is where the world's currencies are swapped for one another. Every time a tourist changes money at an airport, a company pays an overseas supplier, or a fund buys foreign bonds, a currency exchange takes place. Together, these transactions form the largest financial market in the world.

This lesson explains what forex is, who takes part, why prices move and what you should understand before you think about trading it.

How big is the forex market?

Forex is enormous. According to the Bank for International Settlements (BIS) 2022 Triennial Central Bank Survey, average daily turnover in global foreign exchange markets was more than $7 trillion. That figure includes spot trades, forwards, swaps and options, mostly between large financial institutions.

Two features follow from this size:

• High liquidity in major currencies. Popular pairs such as EUR/USD can usually be bought and sold quickly in large amounts. See liquidity.
• Around-the-clock trading. Because financial centers in Asia, Europe and North America open one after another, the market runs roughly 24 hours a day, five days a week.

There is no single forex exchange

Unlike shares listed on a stock exchange, most currency trading is over the counter (OTC). Banks, brokers and electronic platforms quote prices to one another and to their clients directly. That is why the price you see from one provider can differ slightly from another's.

Some currency products, such as futures and certain exchange-traded currency derivatives, do trade on regulated exchanges. Retail traders typically access forex through a broker that offers spot FX or contracts for difference (CFDs), or through exchange-traded currency futures and options where those are the permitted route.

Currencies are traded in pairs

You can't buy "the euro" in isolation. You always exchange it for something else, so every price compares two currencies. This is a currency pair, written like EUR/USD or USD/JPY.

Assume EUR/USD is quoted at 1.0850 (illustrative). That means one euro costs 1.0850 US dollars. If you buy EUR/USD, you are buying euros and selling dollars at the same time. The next lesson, How currency pairs work, covers this in detail.

Who trades forex, and why?

Most of the volume comes from institutions. Retail traders are a small share of the market, and they usually trade through a broker rather than directly with banks.

Why do exchange rates move?

An exchange rate moves when demand for one currency rises or falls relative to the other. Common drivers include:

• Interest rates. Higher rates can attract capital into a currency, all else being equal.
• Economic data. Inflation, employment and growth figures shape expectations about a country's economy and its central bank.
• Trade and capital flows. Exporters, importers and investors all create real buying and selling.
• Risk sentiment. In uncertain periods, money often moves toward currencies seen as safer.
• Politics and unexpected events. Elections, policy changes and shocks can move prices sharply.

These factors are covered in more depth in the advanced section of the course.

Worked example: exchanging versus trading

Here are two simple, illustrative examples using EUR/USD at 1.0850.

Exchanging currency. A traveler converts 1,000 euros into dollars. At 1.0850 they receive 1,000 × 1.0850 = 1,085 US dollars, before any fees. You can try similar conversions with the Currency Converter.

Speculating on a price change. A trader buys 10,000 units of EUR/USD at 1.0850, expecting the euro to strengthen. Later the price is 1.0900. The difference is 1.0900 − 1.0850 = 0.0050. Multiplying by 10,000 units gives 0.0050 × 10,000 = $50 profit, before costs. If the price had fallen to 1.0800 instead, the same trade would have lost $50.

The second example shows the core idea of forex trading: you profit if the pair moves in your favor and lose if it moves against you.

Leverage, risk and regulation

Retail forex brokers often offer leverage, which lets you open a position larger than your deposit. Leverage magnifies both gains and losses, and many retail accounts lose money when trading leveraged products. You'll learn the mechanics in What is leverage?.

Rules differ widely between countries. Some regulators cap retail leverage, some restrict which products can be offered, and some do not allow offshore leveraged forex at all. For example, India permits residents to trade currency derivatives only on recognized Indian exchanges, within permitted currency pairs. Always check what your local regulator allows before opening an account. This lesson is educational and is not legal or financial advice.

Common mistakes

• Treating forex as a quick way to get rich. Prices are hard to predict, and losses can come quickly.
• Ignoring costs. Spreads, commissions and overnight financing all reduce results.
• Using an unregulated or unauthorised platform. Check a provider's status with your local regulator first.
• Skipping the basics. Pips, lots and margin determine how much you can win or lose.

Summary

Forex is the global, decentralized market for exchanging currencies. Prices are always quoted in pairs, and they move as supply and demand shift with interest rates, economic data, capital flows and sentiment. Many participants trade for practical business reasons, while retail traders mostly speculate. Trading forex, especially with leverage, carries a substantial risk of loss, and the rules depend on where you live.