What is forex trading?
Learning objectives
Describe what the foreign exchange market is and who participates in it
Explain what decentralised trading means for pricing, volume data and broker quotes
State what a retail trader is actually holding when they trade a currency pair
What is the forex market?
Foreign exchange is the largest financial market in the world by turnover, and the most liquid. Trillions of dollars change hands daily, which is more than every stock exchange on the planet combined.
It exists because currencies need converting. A German manufacturer paid in dollars needs euros. A pension fund buying Japanese equities needs yen. A tourist needs cash. Underneath the speculation is a genuine, enormous, continuous need to swap one currency for another.
Who is actually in it
Worth knowing, because it tells you what you're up against.
- Commercial and investment banks. The largest participants, quoting prices to each other and to everyone else.
- Corporations. Hedging currency exposure on real trade. Not trying to profit, trying to remove uncertainty.
- Central banks. Managing reserves and occasionally intervening directly.
- Hedge funds and asset managers. Speculative and positioning flows, often very large.
- Retail traders. A small fraction of total volume.
What is trading? Markets, brokers and where you fit in made this point and it bears repeating here. You are the smallest participant in the deepest market that exists. Your advantage is not information or speed. It's that nobody forces you to trade.
No exchange, and what that means
Unlike shares, forex has no central exchange. It's an over-the-counter market: a network of banks, brokers and electronic platforms dealing directly with each other.
Three consequences follow, and they surprise people coming from equities.
There is no single official price. Two brokers can quote EUR/USD a fraction apart at the same instant, because each is aggregating from its own set of liquidity providers. Neither is wrong.
There is no reliable volume data. Since no exchange records every trade, the volume figure on your chart is your broker's volume, or tick count, not the market's. Any analysis technique that depends on true volume is working with a proxy.
Hours are set by participation, not by a bell. Which is why the market runs continuously from Sunday evening to Friday evening rather than opening and closing each day.
Twenty-four hours, five days
Trading follows the working day around the globe. Sydney opens, then Tokyo, then London, then New York, and by the time New York closes, Sydney is opening again.
Within the week, that means no daily gaps. You can act on news at any hour, and a position can move while you sleep. Across the weekend the market does close, and Sunday's opening price can differ from Friday's close, which is the gap risk Stop losses: where to set them and why covered.
Forex sessions and liquidity covers which hours actually matter for your trading.
What you are actually holding
Here's the part beginners get wrong.
When you trade EUR/USD with a retail broker, nobody delivers euros to you. You are not converting currency. You hold a contract whose value tracks the exchange rate, settled in cash, and carrying a financing charge for every night you keep it open.
What is a CFD (and what you're actually trading) covers the mechanics in full. The practical test is simple: if your platform charges a swap on a position held overnight, you are holding a leveraged contract, not a pile of foreign banknotes.
Why people trade it
Four honest reasons, and one caution.
Cost. Major pairs carry the tightest spreads available in a retail account, which matters more than beginners expect, as How traders make money: bid, ask, spread, long and short showed.
Liquidity. Deep markets fill orders close to the quoted price under normal conditions, and slippage is lower than in thinner instruments.
Both directions with equal ease. Every currency trade is long one currency and short another by construction, so there is no structural bias toward rising prices.
Continuity. No overnight gaps within the week, so a position can be exited as it goes wrong rather than jumping past your stop.
The caution: none of this makes forex easier. A deep, liquid, heavily analysed market is one where any obvious edge has already been competed away by participants far better resourced than you. Liquidity protects your execution. It does nothing for your judgement.
Key takeaways
Forex is the largest and most liquid market in the world, driven by genuine commercial demand as well as speculation, with retail traders a small fraction of volume
It has no central exchange, so there's no single official price, no true volume data, and hours set by participation rather than by an opening bell
Retail forex is a leveraged cash-settled contract, not currency conversion. The overnight swap charge is the giveaway
Tight spreads, deep liquidity and continuous pricing improve your execution. They don't make the market easier to be right about