A trader thinks that the European Central Bank (ECB) will be easing its monetary policy in the coming months as the Eurozone’s economy slows. As a result, the trader bets that the euro will fall against the U.S. dollar and sells short €100,000 at an exchange rate of 1.15. Over the next several weeks the ECB signals that it may indeed ease its monetary policy. That causes the exchange rate for the euro to fall to 1.10 versus the dollar. It creates a profit for the trader of $5,000.

The foreign exchange market is where currencies are traded. Currencies are important to most people around the world, whether they realize it or not, because currencies need to be exchanged in order to conduct foreign trade and business. If you are living in the U.S. and want to buy cheese from France, either you or the company that you buy the cheese from has to pay the French for the cheese in euros (EUR). This means that the U.S. importer would have to exchange the equivalent value of U.S. dollars (USD) into euros. The same goes for traveling. A French tourist in Egypt can't pay in euros to see the pyramids because it's not the locally accepted currency. As such, the tourist has to exchange the euros for the local currency, in this case the Egyptian pound, at the current exchange rate.