Forex trading is the act of buying and selling currencies on the foreign exchange market with the goal of profiting from changes in their exchange rates. It is the largest financial market in the world, with more than $7.5 trillion changing hands every day. That figure exceeds the combined daily trading volume of all global stock markets.
The basic mechanics are simple. A trader buys one currency and simultaneously sells another. Currencies always trade in pairs, such as EUR/USD (euro against the U.S. dollar) or GBP/JPY (British pound against the Japanese yen). The first currency in the pair is the base currency, and the second is the quote currency. The price tells you how much of the quote currency you need to buy one unit of the base currency. If EUR/USD trades at 1.1000, it costs $1.10 to buy one euro.
A trader makes money when the exchange rate moves in their favor. If you buy EUR/USD at 1.1000 and the price rises to 1.1050, you sell the euro back for more dollars than you paid, pocketing the difference. If the price falls, you lose money. Every forex trade is a bet that one currency will strengthen relative to another.
How prices move
Currency prices change for the same reasons any asset price changes: supply and demand. If more people want to buy euros than sell them, the euro goes up. What drives that demand is a mix of interest rates, economic data, political events, and market sentiment.
Central banks play an outsized role. When the Federal Reserve raises interest rates, the U.S. dollar tends to strengthen because higher rates attract foreign capital seeking better returns. When the European Central Bank cuts rates, the euro tends to weaken. Traders watch each central bank's statements and economic projections closely, often adjusting positions within seconds of a rate decision.
Economic reports move prices too. Non-farm payrolls, inflation readings like CPI, and GDP growth numbers all tell traders whether an economy is heating up or cooling down. A stronger economy typically supports a stronger currency.
Who trades forex
Two large groups dominate. The first is banks, corporations, and central banks who trade for commercial or policy reasons. A company importing goods from Japan buys yen to pay its suppliers. A central bank intervenes to stabilize its currency. Those trades make up most of the volume.
The second group is retail traders, individuals speculating from home using a broker and an online platform. Retail participation has grown sharply over the past decade, fueled by accessible trading apps and low minimum account sizes.
Leverage and margin
The single most important thing to understand about forex trading is leverage. Forex is almost always traded on margin, meaning the trader puts up a fraction of the trade's value as collateral and the broker lends the rest. A typical retail broker offers 30:1 leverage in major currency pairs under EU regulations, and higher ratios in other jurisdictions.
That leverage cuts both ways. With 30:1 leverage, a 3.3% move against the position wipes out the entire margin. A 3.3% currency move is not unusual; the euro falls that much in a single week during volatile periods. Many beginners lose their entire deposit within their first few months.
A worked example: a trader opens an account with $1,000 and buys one standard lot of EUR/USD at 1.1000. A standard lot is 100,000 units of base currency. With 30:1 leverage, the trader needs $3,333 in margin. The account has $1,000, so the broker would not allow that trade on most regulated platforms. In jurisdictions where 100:1 leverage is offered, the margin requirement is $1,000 exactly, meaning the trader is fully committed on a single trade. Any adverse move closes the account.
Long and short
Forex trading has no directional restriction. A trader can buy a pair expecting it to rise, which is going long. They can sell a pair expecting it to fall, which is going short. The mechanism works because every trade involves buying one currency and selling the other. Going short EUR/USD means selling euros and buying dollars. If the euro falls, the trader buys euros back cheaper and pockets the difference.
Spreads and costs
Brokers make money on the spread, the difference between the buy price and the sell price. On EUR/USD the spread is usually a fraction of a pip, one pip being the smallest price move, typically 0.0001 for most pairs. A one-pip spread on a standard lot costs $10. Active traders can pay thousands in spreads over a year.
A checklist for the new trader:
Understand leverage before funding the account. A 30:1 ratio means one wrong trade can erase the deposit.
Use a demo account for at least three months. Real money amplifies emotions.
Trade only major pairs at first, EUR/USD, USD/JPY, GBP/USD. Small or exotic pairs have wider spreads and more volatile moves.
Know the session schedule. Forex trades 24 hours a day Monday through Friday, but liquidity concentrates around the London and New York sessions.
Have an exit plan before entering a trade. That includes a stop-loss level that limits losses to a percentage of the account.
Risks
Forex trading carries substantial risk of loss. Most retail traders lose money. The leverage that makes profits look easy is the same mechanism that drains accounts. Currency markets react to news that is unpredictable: a central bank statement, a jobs report, a geopolitical event. A trade can gap through a stop-loss level on a weekend when the market is closed, leaving the trader with losses larger than anticipated. Regulated brokers in jurisdictions like the UK, EU, and Australia offer negative balance protection, but not all brokers do.
Regulation
In the UK, the Financial Conduct Authority regulates forex brokers. In the EU, the European Securities and Markets Authority sets leverage limits and transparency rules. In the US, the Commodity Futures Trading Commission oversees the market. Brokers operating without regulation in jurisdictions like the British Virgin Islands or St. Vincent and the Grenadines carry higher counterparty risk. A regulated broker segregates client funds from operating capital. An unregulated one may not.
Prepared with AlphaScala editorial tooling, examples, and risk-context checks against our education standards. General education only, not personalized financial advice.