Forex trading is the simultaneous buying of one currency and selling another. Currencies are traded through a broker or dealer, and are traded in pairs.
For example the euro and the U.S. dollar (EUR/USD) or the British pound and the Japanese yen (GBP/JPY).
When you trade in the forex market, you buy or sell in currency pairs.
Imagine each currency pair constantly in a “tug of war” with each currency on its own side of the rope. Exchange rates fluctuate based on which currency is stronger at the moment.