Online forex or currency trading is growing like wildfire. Mostly they have seen advertisements about the amount of money that may be made in this trillion dollar market. When it does, you exchange it back (close your trade) for a nice profit. If it falls, you lose. So there’s a risk and it can be a huge risk relying how much you exchange on each trade. Most traders don’t try to monitor the values of all currencies at the same time. There are around 150 currencies altogether, so that the possible combos are in the thousands. Most traders focus on just 1 or 2 of the major currency pairs. These involve the US dollar with the EUR, Japanese yen, British pound, Swiss franc, Canadian dollar or Australian dollar.
You can trade forex from nearly anywhere in the world, though there are some states such as China where online forex isn’t legal for political reasons.