What Is Forex Trading? How the Global Currency Market Works

Forex trading (foreign exchange trading) is the exchange of one currency for another at an agreed rate. Currencies are exchanged by businesses paying overseas suppliers, institutions managing international assets, banks supplying liquidity, central banks conducting operations and market participants taking or hedging currency exposure. The market is not a single global stock exchange: most foreign exchange trading takes place bilaterally or on electronic venues within a decentralised over-the-counter network.

This guide explains the economic purpose, market structure, scale, participants, pricing, trading hours, instruments, settlement processes and risks of the global currency market. It distinguishes genuine currency exchange from leveraged retail products whose outcomes depend on exchange-rate movements.

What is the foreign exchange market?

The foreign exchange or FX market is the network through which currencies are valued, exchanged, financed and hedged. An exchange rate tells us how much of one currency is required to obtain a unit of another. The quotation EUR/USD 1.1000, for example, means one euro is worth 1.10 US dollars at that illustrative rate. A currency transaction always involves two currencies: a participant buys one while selling the other.

Foreign exchange serves the real economy as well as financial markets. A British importer may need US dollars to pay an American supplier. A European pension fund holding US shares may want to reduce exchange-rate exposure. An airline paying for fuel in dollars may hedge future dollar costs. A global bank may exchange funds between currencies to manage customer payments and liquidity. Some participants, of course, also seek returns from changes in exchange rates; speculation is one activity among many rather than the entire purpose of Forex.

Why do currencies have different values?

Exchange rates are relative prices. A currency’s purchasing power at home, the expected path of its interest rates, confidence in its institutions, expected investment returns, international financing needs and demand for its assets can all influence its value abroad. A rise in a country’s interest rates does not automatically cause appreciation: the outcome depends on what markets anticipated, what happens to real interest rates, the growth outlook, risk appetite and whether the policy change signals economic stress.

The market therefore prices a constantly changing comparison between two economies and two currencies. For EUR/USD, a stronger euro can raise the exchange rate, a weaker dollar can raise it, or both can happen together. The quote alone does not reveal the cause.

How large is the Forex market?

The Bank for International Settlements’ 2025 Triennial Central Bank Survey provides an authoritative benchmark. The BIS’s final results report about US$9.5 trillion in average daily global over-the-counter FX turnover in April 2025, approximately 27% more than in April 2022. An earlier September 2025 release reported a preliminary $9.6 trillion; the final, subsequently revised figure is the appropriate one to use here.

Importantly, this is turnover across spot and FX derivatives, not a measure of how much new wealth or net investment is created each day. Both legs of financial intermediation, hedging and funding can contribute to trading volumes. It also describes trading activity in the April 2025 survey period, not a continuously updated daily figure for every month.

Source: BIS final 2025 FX turnover table, rounded from millions of US dollars. Instrument totals and category definitions can differ from preliminary September 2025 reporting.

The predominance of FX swaps is a useful corrective to the idea that the currency market consists mainly of short-term trades based on chart patterns. Much of the market facilitates financing, hedging and operational balance-sheet management. The US dollar appears on one side of the vast majority of transactions because it is widely used as an invoicing, investment and funding currency.

Who trades in the Forex market?

The FX market is made up of participants with quite different objectives. Understanding those motivations is more useful than imagining that every market participant is trying to predict the next price movement.

Commercial and investment banks

Banks quote exchange rates to customers, process cross-border transactions, supply liquidity and manage their own foreign-currency positions. A dealer who provides dollars to a customer may offset the resulting risk by transacting with another customer, another dealer or a trading venue. A bank may also internalise opposing customer flows, meaning not every client transaction produces an identical transaction in the interdealer market.

Non-bank liquidity providers and electronic trading firms

Electronic market makers and other non-bank firms can provide liquidity by quoting prices and managing inventories across trading venues. Their activity can support price discovery and competition, but available liquidity is not necessarily stable: it can deteriorate sharply around major news or under market stress.

Corporations engaged in international business

Importers, exporters and multinational businesses exchange currencies for invoices, wages, capital expenditure and acquisitions. They may also use forward contracts to reduce the uncertainty of future foreign-currency receipts or payments. For example, a UK company that will owe a US supplier $1 million in three months faces the risk that sterling depreciates before the payment date.

Investment managers, pension funds and insurers

Cross-border investors face currency risk in addition to the underlying performance of foreign assets. A UK institution holding US bonds may receive dollar interest and principal but report its liabilities in sterling. Hedging can reduce unwanted exchange-rate exposure, although doing so introduces costs, roll decisions and counterparty considerations.

Central banks and sovereign institutions

Central banks manage monetary policy, foreign-exchange reserves and, in some circumstances, foreign-exchange operations. Their objectives are not the same as those of a retail trader. Even when a central bank does not directly transact in the currency market, its decisions can affect the expected path of interest rates and thereby exchange-rate pricing.

Retail traders

Retail investors may access exchange rates through a broker or derivative provider. Some exchange actual currency balances; many retail speculative offerings are leveraged contracts for difference (CFDs), rolling spot FX or spread bets rather than delivery of a currency deposit. The distinction matters for costs, custody, counterparty exposure, leverage and regulation.

How is the Forex market organised?

Unlike the market for many listed shares, the spot FX market has no single compulsory central order book that captures every transaction. It is primarily an over-the-counter (OTC) market: counterparties trade directly or through interconnected electronic platforms, brokers and dealers. The price visible to one participant may depend on its credit relationship, trade size, execution method, available counterparties and timing.

Institutional customers can seek quotes from one or several dealers; electronic venues can match orders or facilitate dealer-to-client trading. Dealers may stream continuously updated prices, request a quote before filling a large order, split a transaction into smaller pieces or employ algorithms to reduce market impact. Trading conventions and obligations vary by contract, venue and jurisdiction.

What is a market maker?

A market maker offers prices at which it is willing to buy and sell a currency pair. It normally quotes two sides: a bid (the price at which it will buy the base currency) and an ask or offer (the price at which it will sell the base currency). The difference is the spread. Spreads contribute to transaction costs and may widen if liquidity becomes scarce or expected volatility increases.

Consider an illustrative EUR/USD quote of 1.0998 / 1.1002. The spread is 0.0004 dollars per euro, or four pips under the standard convention for this pair. Buying €100,000 at the ask would cost $110,020, while selling €100,000 at the bid would raise $109,980. The $40 difference for the same notional is the immediate round-trip bid–ask cost if prices have not moved, before commissions and other charges. It is not a statement about how a given broker will price a real order.

Why can Forex quotes differ between platforms?

Different providers may quote different spreads, add commissions, use different liquidity pools or apply different execution and last-look practices. Screens can also display indicative prices rather than a firm executable price for a particular volume. A seemingly tighter quoted spread does not guarantee a lower total trading cost if an order is filled at a worse price, partially filled or rejected.

The FX Global Code provides voluntary global principles on fair and effective wholesale FX market practices, including execution, information sharing, risk management and settlement. It supplements applicable law rather than replacing regulation.

Understanding currency pairs, exchange rates and pips

For the mechanics of base and quote currencies, spreads and pip calculations, see Currency Pairs Explained.

Forex prices are normally expressed as a pair, such as EUR/USD, GBP/USD or USD/JPY. The first code is the base currency; the second is the quote currency. The price says how many units of the quote currency equal one unit of the base currency.

All rates in this table are hypothetical teaching examples, not live market quotations.

A pip is a conventional minimum price movement unit often equal to 0.0001 for many major pairs and 0.01 for many yen-quoted pairs. Some platforms show fractional pips. Price increments, contract specifications and pip conventions must be checked for the instrument involved.

Worked example: converting a foreign-currency invoice

A UK business owes a supplier €50,000. At an illustrative GBP/EUR rate of 1.1600 euros per pound, the sterling amount is €50,000 ÷ 1.1600 = £43,103.45, before transaction charges. If sterling weakens and GBP/EUR falls to 1.1200, the same invoice costs €50,000 ÷ 1.1200 = £44,642.86. The company faces an additional sterling cost of approximately £1,539.41.

Notice that the company’s exposure arises without speculating at all. It simply needs to pay a real invoice. FX forwards or other hedging arrangements can reduce exchange-rate uncertainty, but the economic trade-off and costs depend on the terms.

When does the Forex market trade?

Institutional FX markets are active across the international business week as Asian, European and American financial centres open in succession. This continuous handover is often described as 24-hour trading from Monday to Friday, but it should not be interpreted as every product, bank, platform or currency pair being available on identical terms at every moment. Market hours, holidays, daily breaks, weekend gaps and settlement schedules vary.

Tokyo, London and New York are major dealing centres; Sydney, Singapore, Hong Kong and other hubs contribute to regional activity. London–New York business-hour overlap is particularly significant for many widely traded pairs, although trading activity varies across currencies, dates and market conditions.

Daylight-saving caution: local session opening times do not map to the same UTC hour all year. The UK and United States change clocks on different dates, and Japan does not use daylight saving. A static session-hours graphic can therefore become misleading unless it states both the season and timezone conventions.

Liquidity is not evenly distributed. Spreads can widen when a particular centre is closed, at the weekly open, near holidays, during sharp macroeconomic announcements, or in periods of stress. More volume does not guarantee straightforward execution: fast-moving markets can expose customers to slippage, gaps and rapidly changing quotes.

How are FX transactions executed and settled?

A typical wholesale spot transaction follows a sequence: two parties agree the currencies, side, amount, exchange rate and value date; the trade is confirmed; payments are instructed; and each party delivers the agreed currency on the settlement date. The operational process matters because completing a deal on a screen is not necessarily the same as final settlement of the cash flows.

Many major spot pairs conventionally settle two good business days after trade date (T+2), subject to both currencies’ relevant holidays and the pair’s rules. Some pairs, including USD/CAD, commonly use a shorter convention. Actual dates must always be checked against the product and currency calendars.

Settlement risk arises if one party pays away the currency it owes but does not receive the currency it bought. Payment-versus-payment arrangements, bilateral limits, confirmation procedures and trade netting are mechanisms used to manage this risk. The FX Global Code emphasises robust confirmation and settlement practices. Settlement and counterparty risk can remain important even when the exchange-rate exposure itself has been hedged.

Spot, forwards, futures, swaps and options: the main instruments

These contracts have different settlement and collateral structures. Compare them in Forex Spot, Forward, Futures and Swap Markets.

The phrase ‘Forex trading’ describes several instruments with different legal and economic structures. Treating them as interchangeable obscures how risk is transferred.

The BIS survey includes OTC foreign-exchange derivatives alongside spot dealing. It is therefore misleading to refer to its total turnover figure as if it represented only the cash spot market or only speculative day trading.

What causes an exchange rate to move?

A fuller explanation of relative growth, rates, positioning and capital flows is provided in What Moves Exchange Rates?.

Exchange rates incorporate evolving expectations. A useful approach is to group currency drivers into several interacting channels:

• Monetary policy: changes in expected short-term interest rates, policy paths and central bank communication.
• Inflation and growth: differences in expected economic activity, real returns and price stability.
• Capital flows: cross-border purchases of securities, business investment, hedging and financing needs.
• External balances: trade, energy-import costs and demand for internationally priced goods or services.
• Risk sentiment: investor preferences for liquidity, safety or higher-yielding assets under different conditions.
• Market positioning: existing exposures, hedging demand and the reaction to unexpected information.

Price reactions depend on the difference between reality and expectations. Suppose a central bank raises rates by 0.25 percentage points after markets had largely expected 0.50. The currency may fall because the decision is less restrictive than priced, even though the policy rate itself increased. Other information in the announcement could modify or outweigh that reaction.

Why is currency analysis necessarily relative?

For GBP/USD, it is not enough to say the UK economy is strengthening. One must compare UK prospects with US prospects and ask how those relative changes affect expected interest rates, capital flows and risk appetite. Strong performance in both countries may still leave the exchange rate little changed. This relative logic is essential to making sense of Forex.

Why the history of Forex matters

International currency exchange is centuries old, but today’s floating exchange-rate environment emerged through major institutional changes. Under the Bretton Woods system established after the Second World War, many countries maintained exchange rates in relation to the US dollar, which itself was linked to gold under the system’s arrangements. The suspension of dollar-to-gold convertibility in 1971 and subsequent breakdown of fixed parities contributed to wider adoption of floating exchange rates among major economies during the 1970s.

Electronic dealing, international capital mobility and sophisticated risk-management instruments later transformed the scale and speed of FX markets. Modern cross-border investment, derivatives trading and bank balance-sheet management now generate very large volumes that should not be confused with physical trade alone. Nevertheless, not all exchange rates float freely: some authorities operate pegs, managed arrangements, bands or other currency regimes.

What are the principal risks of Forex trading?

Risk depends on instrument size and execution conditions as well as market direction. See Position Sizing and Leverage for the distinction between planned and realised losses.

Large daily market turnover is not a guarantee of safety for an individual participant. The important risks depend on whether someone is converting money, hedging a commercial obligation, holding foreign assets or trading a leveraged product.

Exchange-rate and market risk

An adverse movement in the currency pair changes the value of a position or future cash flow. Foreign-exchange rates can gap on political shocks, policy surprises and unexpected liquidity withdrawals. A stop instruction may execute at a different level from the intended stop price, depending on product terms and market conditions.

Leverage and margin risk

Leverage permits exposure larger than the capital committed. A 1% change in the underlying exchange rate can produce a much larger percentage gain or loss relative to posted margin. Margin requirements, forced position closure, financing charges and gaps can compound the danger. Leverage magnifies losses as well as gains; a position sized using only its initial margin can materially understate economic risk.

Counterparty, custody and operational risk

Retail customers face the legal and operational structure of their particular provider. Institutional counterparties face credit, settlement and operational exposures. Disruptions, incorrect trade details, failed payments, platform outages and cyber incidents can produce losses that have little to do with an intended exchange-rate view.

Transaction costs and financing

Spreads, commissions, brokerage fees, financing or rollover charges, conversion costs, and adverse execution can erode returns. Costs vary by instrument and provider. An apparent trading strategy may look profitable before costs but unattractive after realistic execution assumptions.

The UK Financial Conduct Authority characterises CFDs, which include relevant rolling spot FX products, as high-risk products not suitable for all retail consumers. Education about the institutional FX market must not be mistaken for an invitation to use a leveraged retail derivative.

How to approach Forex market education systematically

A coherent starting point is to separate mechanics from analysis and from trading decisions. First understand quotes, bid–ask spreads, settlement and contracts. Next examine the underlying economies, interest-rate expectations, cross-border flows and the market’s existing expectations. Then understand how different instruments express or hedge exposures and how risks are measured.

There is also a difference between a plausible explanation of an exchange-rate movement and a reliable prediction. In markets, the same observation can support more than one interpretation; hindsight can make ambiguous events look inevitable. Good financial education teaches the limits of models, not just the vocabulary of trading.

Key takeaways

• Forex is the exchange of one currency for another; every price is relative to a second currency.
• The FX market is predominantly decentralised and OTC, with many participants using it for payments, hedging and funding.
• Final BIS figures put average global OTC FX turnover at about US$9.5 trillion per day in April 2025, including derivatives as well as spot transactions.
• Exchange rates reflect relative economic expectations, financing conditions, flows and risk appetite rather than a single indicator.
• Institutional currency transactions and leveraged retail Forex products have materially different mechanics and risks.
• Sound education starts with contract specifications, pricing, settlement and risk before considering any trading framework.

Frequently asked questions

Is Forex trading the same as exchanging money for a holiday?

Both involve exchange rates, but holiday currency conversion is usually a straightforward purchase or sale of money through a bank or payment provider. ‘Forex trading’ may also refer to institutional hedging, derivatives or leveraged speculation. The legal contract, costs and risks can be very different.

Is Forex the largest financial market?

By the commonly reported measure of average daily OTC foreign-exchange turnover, FX is exceptionally large. Comparisons with stock markets need care because market capitalisation, exchange-traded volume, notional derivatives turnover and net exposure are different metrics.

Can the currency market close?

Trading is continuous across much of the international business week, but weekends, holidays, daily platform breaks, market interruptions and venue-specific rules affect access and prices. There is no promise of uniform liquidity around the clock.

Does every Forex trade involve physical delivery?

No. Deliverable spot and forward transactions involve currency payments, whereas many retail CFDs are cash-settled derivatives. Exchange-traded futures, options and swaps may have other contractual settlement arrangements.

Does a higher interest rate always strengthen a currency?

No. Markets price expectations and risk. A rate rise that is smaller than anticipated, signals economic problems or accompanies weakening real returns can be associated with depreciation. Relative conditions in the other currency’s economy matter as well.

Can a strategy eliminate Forex risk?

No. Different strategies can alter the type and size of exposure, but exchange-rate, leverage, liquidity, execution, counterparty and operational risks cannot be eliminated simply by choosing a particular analysis method.

Sources and further reading

• BIS — Final April 2025 OTC FX turnover tables (survey statistics and instrument breakdown).
• BIS Quarterly Review — Global FX markets when hedging takes centre stage (December 2025, turnover revisions and drivers).
• Bank of England — 2025 BIS Triennial FX survey (UK survey context).
• New York Federal Reserve — FX Global Code (wholesale market good-practice principles).
• FCA — Contracts for Difference (UK retail product risk and regulatory expectations).

Important educational notice: This article is for general financial markets education only. It does not provide investment advice, a recommendation to trade or an assessment of suitability for any individual. Trading leveraged FX products can result in substantial losses. Historical market data and hypothetical examples are not forecasts.

Further structured learning: Explore the Applied Professional Forex Trading Mini MBA for more systematic education in Forex market structure, analysis and risk management. This course provides education, not trading signals or personalised financial advice.