The foreign exchange market works through financial institutions and operates on several levels. Behind the scenes, banks turn to a smaller number of financial firms known as "dealers", who are involved in large quantities of foreign exchange trading. Most foreign exchange dealers are banks, so this behind-the-scenes market is sometimes called the "interbank market" (although a few insurance companies and other kinds of financial firms are involved). Trades between foreign exchange dealers can be very large, involving hundreds of millions of dollars. Because of the sovereignty issue when involving two currencies, Forex has little (if any) supervisory entity regulating its actions.
For trading purposes, the first currency listed in the pair is always the directional currency on a forex price chart. If you pull up a chart of the EUR/USD, and the price is moving higher, it means the EUR is moving higher relative to the USD. If the price on the chart is falling, then the EUR is declining in value relative to the USD. The attached chart shows this. 
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The foreign exchange market may be left unregulated by governments, with EXCHANGE RATES between currencies being determined by the free interplay of the forces of demand and supply (see FLOATING EXCHANGE RATE SYSTEM), or they may be subjected to support buying and selling by countries' central banks in order to fix them at particular rates (see FIXED EXCHANGE RATE SYSTEM).
To find out how many euros it costs to buy one U.S. dollar, flip the pair to USD/EUR. To find out this rate, divide 1 by 1.3635 (or whatever the current rate is). The result is 0.7334. It costs 0.7334 euros to buy one USD based on the current market price. The price of the currency pair constantly fluctuates, as transactions occur around the globe, 24-hours a day during the week.  

The trade that takes place in Foreign exchange market involves simultaneously the buying of one currency and the selling of another. This is because the value of one currency is relative to the other currency and is determined by their comparison. From a retail trader’s perspective Forex trading is the speculation on the value of one currency relative to another.
FX fundamental analysis concentrates on different factors within the FX market. Traders need to pay attention to fundamental factors such as: gross domestic product (GDP), inflation, economic growth activity, and manufacturing. Thus, fundamental analysis in Forex involves studying the economic strength of various countries, in order to make wise Forex predictions. It provides us with information on how geopolitical and economical events influence the currency market. For example, certain figures and statements given in speeches by politicians or economists are classed amongst traders as 'concrete economical announcements'. These can have a serious impact on currency market moves. In fact, announcements related to the economy or politics in the US are particularly crucial to follow.

If your FOREX broker offers you a leverage of 1:100 you can trade with a 100 times more money than you have in your deposit. This means that if you want to buy 100 000 EUR/USD you only need to have a 1 000 actual euros. With this kind of leverage you can take a position that is a 100 times larger in value and expect a 100 times bigger profits or losses, therefore great care is advisable when placing your trade. Equities, on the other hand, are traded without leverage.

The FXCM Group is headquartered at 20 Gresham Street, 4th Floor, London EC2V 7JE, United Kingdom. Forex Capital Markets Limited (“FXCM LTD”) is authorised and regulated in the UK by the Financial Conduct Authority. Registration number 217689. Registered in England and Wales with Companies House company number 04072877. FXCM Australia Pty. Limited ("FXCM AU") is regulated by the Australian Securities and Investments Commission, AFSL 309763. FXCM AU ACN: 121934432. FXCM South Africa (PTY) Ltd is an authorized Financial Services Provider and is regulated by the Financial Sector Conduct Authority under registration number 46534. FXCM Markets Limited ("FXCM Markets") is an operating subsidiary within the FXCM Group. FXCM Markets is not regulated and not subject to the regulatory oversight that govern other FXCM Group entities, which includes but is not limited to the Financial Conduct Authority, Financial Sector Conduct Authority, and the Australian Securities and Investments Commission. FXCM Global Services, LLC is an operating subsidiary within the FXCM Group. FXCM Global Services, LLC is not regulated and not subject to regulatory oversight.

There are a number of main-players in the Forex market, including central banks, commercial banks, and investment banks. This is known as the interbank market, as they constantly deal with each other on behalf of themselves or their customers. There are a number of other participants in the foreign exchange market, however, which also includes large multinational corporations, global money managers, registered dealers, international money brokers, futures and options traders and individual investors.

The logistics of forex day trading are almost identical to every other market. However, there is one crucial difference worth highlighting. When you’re day trading in forex you’re buying a currency, while selling another at the same time. Hence that is why the currencies are marketed in pairs. So, the exchange rate pricing you see from your forex trading account represents the purchase price between the two currencies.
When you trade forex, you're effectively borrowing the first currency in the pair to buy or sell the second currency. With a US$5-trillion-a-day market, the liquidity is so deep that liquidity providers—the big banks, basically—allow you to trade with leverage. To trade with leverage, you simply set aside the required margin for your trade size. If you're trading 200:1 leverage, for example, you can trade $2,000 in the market while only setting aside $10 in margin in your trading account. For 50:1 leverage, the same trade size would still only require about £40 in margin. This gives you much more exposure, while keeping your capital investment down.
The series of contagious currency crises in the 1990s—in Mexico, Brazil, East Asia, and Argentina—again focused policy makers’ minds on the problems of the international monetary system. Moves, albeit limited, were made toward a new international financial architecture. Most importantly, these crises led to the establishment of the Financial Stability Forum (since 2009 the Financial Stability Board), which investigated the problems of offshore, capital flows, and hedge funds; and the G20, which attempted to broaden the international regime’s membership and thus deepen its legitimacy. In addition, there were calls for a currency transaction tax, named after Nobel Laureate James Tobin’s proposal, from many civil society nongovernmental organizations as well as some governments. The success of international monetary reform is a crucial issue for governments and their autonomy, firms and the stability of their investments, and citizens who ultimately are those who absorb these effects as they are transmitted into everyday life.
The need to exchange currencies is the primary reason why the forex market is the largest, most liquid financial market in the world. It dwarfs other markets in size, even the stock market, with an average traded value of around U.S. $2,000 billion per day. (The total volume changes all the time, but as of August 2012, the Bank for International Settlements (BIS) reported that the forex market traded in excess of U.S. $4.9 trillion per day.)