A foundational introduction to the foreign exchange market: what forex is, how currency pairs are quoted, who trades it, why it runs 24 hours a day, and the core risks every currency trader must understand.
Key Takeaways
- Forex is the global market where currencies are traded against each other in pairs.
- It is the largest, most liquid market in the world, running nearly 24 hours a day, five days a week.
- A pair’s price is how much of the quote currency one unit of the base currency costs.
- Leverage in forex is high, which makes position sizing critical to survival.
- Forex has no central exchange — it is an over-the-counter network of banks and brokers.
What Is Forex?
Forex (foreign exchange) is the global marketplace where one currency is traded for another. When you see EUR/USD at 1.1000, it means one euro costs 1.1000 US dollars. Every forex trade simultaneously buys one currency and sells another — you always trade a pair, never a single currency in isolation.
The forex market is the largest and most liquid in the world, with daily turnover exceeding $7 trillion. It has no central exchange; instead it is an over-the-counter (OTC) network of banks, brokers, institutions, and retail traders connected electronically. Trading runs nearly 24 hours a day, five days a week, following the sun from Sydney to Tokyo to London to New York.
Key Takeaways
- Currencies trade in pairs — you buy one while selling the other.
- The base currency is the first in the pair; the quote currency is the second.
- Price moves in pips — usually the fourth decimal place (0.0001).
- Leverage is high, so small price moves translate to large dollar results.
How Currency Pairs Are Quoted
In the pair EUR/USD, EUR is the base currency and USD is the quote currency. The quoted price (1.1000) is the amount of quote currency needed to buy one unit of the base. If you believe the euro will strengthen against the dollar, you buy EUR/USD; if you believe it will weaken, you sell.
| Pair | Base | Quote | Meaning |
|---|---|---|---|
| EUR/USD | EUR | USD | Euro in US dollars |
| USD/JPY | USD | JPY | US dollar in Japanese yen |
| GBP/USD | GBP | USD | British pound in US dollars |
| USD/CAD | USD | CAD | US dollar in Canadian dollars |
Majors are the most-traded pairs (all including USD). Crosses are pairs without USD (e.g., EUR/GBP). Exotics pair a major currency with one from a smaller economy (e.g., USD/TRY) and carry wider spreads and higher volatility.
Who Trades Forex?
- Banks and institutions: the bulk of volume, for clients and proprietary books.
- Corporations: to hedge international revenue and costs.
- Central banks: to manage currency reserves and influence exchange rates.
- Retail traders: speculating on short-term currency moves via brokers.
Why Forex Runs 24 Hours
Because the market spans global financial centers, there is always an open session somewhere. Liquidity and volatility peak when two sessions overlap — especially the London and New York overlap (roughly 13:00–17:00 UTC), which produces the tightest spreads and largest moves.
The Risks of Forex Trading
- Leverage risk: high leverage magnifies losses as much as gains.
- Volatility risk: news events can move pairs hundreds of pips in minutes.
- Gap risk: weekend gaps can blow past stops when the market reopens Sunday.
- Interest-rate risk: rate decisions shift currency values rapidly.
- Counterparty risk: OTC brokers can fail; regulation varies by jurisdiction.
Position Sizing for Forex
Forex sizing is built on pip value and lot size. The TradeRiskMath forex calculator converts your account equity, risk %, entry, and stop (in pips) into an exact lot size and dollar risk — so a 30-pip stop on EUR/USD never risks more than your planned 1%–2%.
Frequently Asked Questions
What is forex trading?
Forex (foreign exchange) is the buying of one currency while selling another, traded in pairs. It is the world’s largest and most liquid market, open 24 hours a day across global sessions.
What is a currency pair?
A pair quotes two currencies, for example EUR/USD shows how many US dollars one euro costs. The first currency is the base, the second is the quote; you buy or sell the pair as a unit.
Why is forex leveraged?
Because daily currency moves are tiny (often under 1%), brokers offer high leverage so traders can turn small moves into meaningful gains and losses. Leverage is why sizing from risk is critical.
What is a pip?
A pip is the smallest standard price move for a pair, usually the fourth decimal place (0.0001), or the second for JPY pairs. Pips measure stop distance and profit in forex.
Where can I size a forex trade?
The TradeRiskMath Forex calculator turns your dollar risk and pip stop into a lot size. Open it from the Forex hub.
The Bottom Line
Forex is the world’s largest market — liquid, continuous, and leveraged. Understanding pairs, pips, sessions, and the risks of leverage is the foundation. Pair that knowledge with disciplined position sizing and you can participate in currencies without letting leverage participate in your ruin.
Related tools
Open Forex Calculator Forex Risk Hub Forex Pips, Lots & Sizing
Educational Disclaimer
This article is provided strictly for educational purposes and does not constitute financial, investment, or trading advice. Trading stocks, options, futures, forex, and crypto involves substantial risk of loss. Always evaluate trades against your own financial situation and risk tolerance, and consult a licensed professional before making investment decisions. Past performance does not guarantee future results.