Forex (FX)

What is forex?

Forex (short for “foreign exchange,” also called FX) is the global marketplace where currencies are bought and sold against one another. Unlike a stock exchange, forex has no single physical location or central exchange — it’s a decentralized network of banks, brokers, institutions, and individual traders connected electronically around the world.

Every transaction in forex involves a currency pair: you are always simultaneously buying one currency and selling another, speculating that the exchange rate between them will move in your favor.

Why forex is so large and liquid

Forex is widely considered the largest financial market by trading volume, driven by the sheer breadth of participants: central banks managing monetary policy, commercial banks facilitating international trade, corporations hedging currency exposure, hedge funds and institutional investors, and retail traders speculating on price moves. This constant, diverse flow of activity is what gives major pairs their deep liquidity — the ability to buy or sell large amounts without dramatically moving the price.

When forex trades

Because currencies are needed somewhere in the world at virtually every hour, forex operates across forex market hours that span 24 hours a day, five days a week, rolling continuously through the major regional trading sessions (Sydney, Tokyo, London, and New York) rather than opening and closing like a traditional stock exchange.

Worked example

Suppose a US-based trader believes the euro will strengthen against the dollar due to an upcoming central-bank decision. They buy EUR/USD at 1.0850. A day later, the euro has strengthened and EUR/USD trades at 1.0900 — a 50-pip move. If the trader closed a 1-standard-lot position, that move is worth roughly $500 in profit (50 pips × ~$10/pip), illustrating how forex trading translates currency-market views directly into a monetary outcome.

Why it matters to a trader

Understanding forex as a market — its structure, its participants, and its round-the-clock nature — is the foundation for everything else in currency trading: how spreads form, why liquidity varies by session, and how leverage is used to size positions relative to a trading account.

Quick recap

• Forex is the global, decentralized market for trading currencies against one another.
• It’s driven by a broad mix of participants and is highly liquid for major pairs.
• The market runs continuously across global trading sessions, five days a week.