Forex trading as it relates to retail traders (like you and I) is the speculation on the price of one currency against another. For example, if you think the euro is going to rise against the U.S. dollar, you can buy the EURUSD currency pair low and then (hopefully) sell it at a higher price to make a profit. Of course, if you buy the euro against the dollar (EURUSD), and the U.S. dollar strengthens, you will then be in a losing position. So, it’s important to be aware of the risk involved in trading Forex, and not only the reward.
Currency carry trade refers to the act of borrowing one currency that has a low interest rate in order to purchase another with a higher interest rate. A large difference in rates can be highly profitable for the trader, especially if high leverage is used. However, with all levered investments this is a double edged sword, and large exchange rate price fluctuations can suddenly swing trades into huge losses.
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.