Imagine a trader who expects interest rates to rise in the U.S. compared to Australia while the exchange rate between the two currencies (AUD/USD) is 0.71 (it takes $0.71 USD to buy $1.00 AUD). The trader believes higher interest rates in the U.S. will increase demand for USD, and therefore the AUD/USD exchange rate will fall because it will require fewer, stronger USD to buy an AUD.
The broker basically resets the positions and provides either a credit or debit for the interest rate differential between the two currencies in the pairs being held. The trade carries on and the trader doesn't need to deliver or settle the transaction. When the trade is closed the trader realizes their profit or loss based on their original transaction price and the price they closed the trade at. The rollover credits or debits could either add to this gain or detract from it.

The modern foreign exchange market began forming during the 1970s. This followed three decades of government restrictions on foreign exchange transactions under the Bretton Woods system of monetary management, which set out the rules for commercial and financial relations among the world's major industrial states after World War II. Countries gradually switched to floating exchange rates from the previous exchange rate regime, which remained fixed per the Bretton Woods system.
Caution: Trading involves the possibility of financial loss. Only trade with money that you are prepared to lose, you must recognise that for factors outside your control you may lose all of the money in your trading account. Many forex brokers also hold you liable for losses that exceed your trading capital. So you may stand to lose more money than is in your account. ForexSignals.com takes no responsibility for loss incurred as a result of our trading signals. By signing up as a member you acknowledge that we are not providing financial advice and that you are making a the decision to copy our trades on your own account. We have no knowledge on the level of money you are trading with or the level of risk you are taking with each trade. You must make your own financial decisions, we take no responsibility for money made or lost as a result of our signals or advice on forex related products on this website.
The profit you made on the above theoretical trade depends on how much of the currency you purchased. If you bought 1,000 units in USD (called a micro lot) each pip is worth $0.10, so you would calculate your profit as (50 pips x $0.10) = $5 for a 50 pip gain. If you bought a 10,000 unit (mini lot), then each pip is worth $1, so your profit ends up being $50. If you bought a 100,000 unit (standard lot) each pip is worth $10, so your profit is $500.

One unique aspect of this international market is that there is no central marketplace for foreign exchange. Rather, currency trading is conducted electronically over-the-counter (OTC), which means that all transactions occur via computer networks between traders around the world, rather than on one centralized exchange. The market is open 24 hours a day, five and a half days a week, and currencies are traded worldwide in the major financial centers of London, New York, Tokyo, Zurich, Frankfurt, Hong Kong, Singapore, Paris and Sydney—across almost every time zone. This means that when the trading day in the U.S. ends, the forex market begins anew in Tokyo and Hong Kong. As such, the forex market can be extremely active any time of the day, with price quotes changing constantly.

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