The foreign exchange market — "forex" or "FX" for short — is where currencies are exchanged for one another. It's the largest financial market in the world by trading volume, operating nearly 24 hours a day across different time zones as trading desks in Sydney, Tokyo, London, and New York hand off to each other through the trading week.

Unlike a stock, which represents ownership in a single company, a currency's value only makes sense relative to another currency. That's why forex is always traded in pairs — EUR/USD, GBP/JPY, USD/TZS — and why a "price" in forex tells you how much of one currency it takes to buy one unit of the other.

Who actually trades forex?

The market isn't just retail traders watching charts. The biggest participants are central banks managing monetary policy, commercial banks handling client and interbank flows, corporations converting revenue earned in foreign markets, and investment funds hedging international positions. Retail trading — individuals speculating on price movements through a broker — is a much smaller slice of the total volume, though it's the part most people encounter first.

Why currencies move

A currency's relative value shifts with things like interest rate decisions, inflation data, trade balances, political stability, and overall risk appetite in global markets. When a country's central bank raises interest rates, for example, its currency often becomes more attractive to hold because it pays more to park money there — all else being equal. None of these relationships are simple or guaranteed, though; multiple forces are usually pulling in different directions at once.

Before you go further

Forex is accessible and liquid, but it's also fast-moving and can involve leverage (borrowed exposure) that magnifies both gains and losses — covered in a separate article. Understanding the mechanics first — what a pair is, how a quote is read, what moves prices — is a far better starting point than jumping straight into trying to predict direction.