Up until World War I, currencies were pegged to precious metals, such as gold and silver. But the system collapsed and was replaced by the Bretton Woods agreement after the second world war. That agreement resulted in the creation of three international organizations to facilitate economic activity across the globe. They were the International Monetary Fund (IMF), General Agreement on Tariffs and Trade (GATT), and the International Bank for Reconstruction and Development (IBRD). The new system also replaced gold with the US dollar as peg for international currencies. The US government promised to back up dollar supplies with equivalent gold reserves.
And so we come to the question of how to predict Forex movement? Fortunately, economists created the standard economic calendar, where they make daily predictions around various economic values based upon recent history. It generally contains the following data: date, time, currency, data released, actual, forecast, and previous. There are certain economic figures, which when announced, nearly always have a heavy impact on the movement of the FX market.
The Forex (FOReign EXchange) market appeared at the end of the 1970s after many countries decided to unpeg their currency value from that of the US dollar or gold. This led to the formation of an international market on which currency could be exchanged and traded freely. Today, Forex is the largest financial market in the world. It doesn’t matter where you live or even where you are right now; as long as you have access to the Internet, a trading terminal (a special program for trading Forex), and an account with a Forex broker, all the instruments and opportunities of Forex are available to you.
The foreign exchange market is the "place" 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.