Although the foreign exchange market is often billed as a banker's game, currencies can sometimes be great diversification for a portfolio that might have hit a bit of a rut. It's a market that can also offer tremendous opportunity when other global forums enter the doldrums. As a result, knowing a little bit about forex, and the fundamentals behind it, can make significant additions to any trader, investor or portfolio manager's arsenal. Let's take a look at eight currencies every trader or investor should know, along with the central banks of their respective nations. (Absolute beginners should check out our Forex Walkthrough for more information.)

1. U.S. Dollar (USD)Central Bank: Federal Reserve (Fed)Current Interest Rate Information: http://www.federalreserve.gov/releases/h15/data.htm

The Almighty DollarCreated in 1913 by the Federal Reserve Act, the Federal Reserve System (also called the Fed) is the central banking body of the U.S. The system is itself headed by a chairman and board of governors, with most of the focus being placed on the branch known as the Federal Open Market Committee (FOMC). The FOMC supervises open market operations as well as monetary policy or interest rates.

The current committee is comprised of five of the 12 current Federal Reserve Bank presidents and seven members of the Federal Reserve Board, with the Federal Reserve Bank of New York always serving on the committee. Even though there are 12 voting members, non-members (including additional Fed Bank presidents) are invited to share their views on the current economic situation when the committee meets every six weeks. (For more information on the Federal Reserve, read our Federal Reserve tutorial.)

Sometimes referred to as the greenback, the U.S. dollar (USD) is the home denomination of the world's largest economy, the United States. As with any currency, the dollar is supported by economic fundamentals, including gross domestic product, and manufacturing and employment reports. However, the U.S. dollar is also widely influenced by the central bank and any announcements about interest rate policy. The U.S. dollar is a benchmark that trades against other major currencies, especially the euro, Japanese yen and British pound. (For further reading about trading this currency, see Taking Advantage Of A Weak U.S. Dollar.)

2. European Euro (EUR)Central Bank: European Central Bank (ECB)Current Interest Rate: http://www.ecb.int/stats/monetary/rates/html/index.en.html

The Dollar's NemesisHeadquartered in Frankfurt, Germany, the European Central Bank is the central bank of the 17 member countries of the eurozone. In similar fashion to the United States' FOMC, the ECB has a main body responsible for making monetary policy decisions, the Executive Council, which is composed of five members and headed by a president. The remaining policy heads are chosen with consideration that four of the remaining seats are reserved for the four largest economies in the system, which include Germany, France, Italy and Spain. This is to ensure that the largest economies are always represented in the case of a change in administration. The council meets approximately 10 times a year. (Read more about this and other central banks discussed here in Get To Know The Major Central Banks.)
In addition to having jurisdiction over monetary policy, the ECB also holds the right to issue banknotes as it sees fit. Similarly to the Federal Reserve, policy makers can interject at times of bank or system failures. The ECB differs from the Fed in an important area: instead of maximizing employment and maintaining stability of long-term interest rates, the ECB works towards a prime principle of price stability, with secondary commitments to general economic policies. As a result, policymakers will turn their focus to consumer inflation in making key interest rate decisions. (Read more about how central banks control inflation in What Are Central Banks?)

Although the monetary body is somewhat complex, the currency is not. Against the U.S. dollar, the euro (EUR) tends to be a slower currency compared to its colleagues (i.e., the British pound or Australian dollar). On an average day, the base currency can trade between 30-40 pips, with more volatile swings averaging slightly more, at 60 pips wide per day. Another trading consideration is time. Trading in the euro-based pairs can be seen during the London and U.S. sessions (which occur from 2am through 11am EST). (Read more about choosing the optimal time to trade in How To Set A Forex Trading Schedule.)

3. Japanese Yen (JPY)Central Bank: Bank of Japan (BoJ)Current Interest Rate: http://www.boj.or.jp/en/index.htm

Technically Complex, Fundamentally SimpleEstablished as far back as 1882, the Bank of Japan serves as the central bank to the world's second largest economy. It governs monetary policy as well as currency issuance, money market operations and data/economic analysis. The main Monetary Policy Board tends to work toward economic stability, constantly exchanging views with the reigning administration, while simultaneously working toward its own independence and transparency. Meeting 12-14 times a year, the governor leads a team of nine policy members, including two appointed deputy governors.

The Japanese yen (JPY) tends to trade under the identity of a carry trade component. Offering a low interest rate, the currency is pitted against higher-yielding currencies, especially the New Zealand and Australian dollars and the British pound. As a result, the underlying tends to be very erratic, pushing traders to take technical perspectives on a longer-term basis. Average daily ranges are in the region of 30-40 pips, with extremes as high as 150 pips. To trade this currency with a little bit of a bite, focus on the crossover of London and U.S. hours (6am - 11am EST). (Read more about forex carry trades in Currency Carry Trades Deliver.)

4. British Pound (GBP)Central Bank: Bank of England (BoE)Current Interest Rate: http://www.bankofengland.co.uk/

The Queen's CurrencyAs the main governing body in the United Kingdom, the Bank of England serves as the monetary equivalent of the Federal Reserve System. In the same fashion, the governing body establishes a committee headed by the governor of the bank. Made up of nine members, the committee includes four external participants (appointed by the Chancellor of Exchequer), a chief economist, director of market operations, committee chief economist and two deputy governors.

Meeting every month of the year, the Monetary Policy Committee (MPC) decides on interest rates and broader monetary policy, with primary considerations of total price stability in the economy. As such, the MPC also has a benchmark of consumer price inflation set at 2%. If this benchmark is compromised, the governor has the responsibility to notify the Chancellor of Exchequer through a letter, one of which came in 2007 as the U.K. CPI rose sharply to 3.1%. The release of this letter tends to be a harbinger to markets, as it increases the probability of contractionary monetary policy. (For more on the role of the CPI, read The Consumer Price Index: A Friend To Investors.)

A little bit more volatile than the euro, the British pound (GBP, also sometimes referred to as "pound sterling" or "cable") tends to trade a wider range through the day. With swings that can encompass 100-150 pips, it isn't unusual to see the pound trade as narrowly as 20 pips. Swings in notable cross currencies tend to give this major a volatile nature, with traders focusing on pairs like the British pound/Japanese yen and the British pound/Swiss franc. As a result, the currency can be seen as most volatile through both London and U.S. sessions, with minimal movements during Asian hours (5pm - 1am EST). (Read more about currency pairs in Using Currency Correlations To Your Advantage.)

5. Swiss Franc (CHF)Central Bank: Swiss National Bank (SNB)Current Interest Rate: http://www.snb.ch/en/iabout/stat/statpub/zidea/id/current_interest_exchange_rates

A Banker's CurrencyDifferent from all other major central banks, the Swiss National Bank is viewed as a governing body with private and public ownership. This belief stems from the fact that the Swiss National Bank is technically a corporation under special regulation. As a result, a little over half of the governing body is owned by the sovereign states of Switzerland. It is this arrangement that emphasizes the economic and financial stability policies dictated by the governing board of the SNB. Smaller than most governing bodies, monetary policy decisions are created by three major bank heads who meet on a quarterly basis.

The governing board creates the band (plus or minus 25 basis points) of where the interest rate will reside.

Similar to the euro, the Swiss franc (CHF) hardly makes significant moves in the any of the individual sessions. As a result, look for this particular currency to trade in the average daily range of 35 pips per day. High-frequency volume for this currency is usually pitted for the London session (2am - 8am EST). (For more on the CHF, read Forex: Making Sense Of The Euro/Swiss Franc Relationship.)

6. Canadian Dollar (CAD)Central Bank: Bank of Canada (BoC)Current Interest Rate: http://www.bankofcanada.ca/en/rates/interest-look.html

The Loonie Established by the Bank of Canada Act of 1934, the Bank of Canada serves as the central bank called upon to "focus on the goals of low and stable inflation, a safe and secure currency, financial stability and the efficient management of government funds and public debt." Acting independently, Canada's central bank draws similarities with the Swiss National Bank because it is sometimes treated as a corporation, with the Ministry of Finance directly holding shares. Despite the proximity of the government's interests, it is the responsibility of the governor to promote price stability at an arm's length from the current administration, while simultaneously considering the government's concerns. With an inflationary benchmark of 2-3%, the BoC has tended to remain a shade more hawkish rather than accommodative when it comes to any deviations in prices.

Keeping in touch with major currencies, the Canadian dollar (CAD) tends to trade in similar daily ranges of 30-40 pips. However, one unique aspect about the currency is its relationship with crude oil, as the country remains a major exporter of the commodity. As a result, plenty of traders and investors use this currency as either a hedge against current commodity positions or pure speculation, tracing signals from the oil market. (Read more about the CAD's relationship with oil in Commodity Prices And Currency Movements.)

7. Australian/New Zealand Dollar (AUD/NZD)Central Bank: Reserve Bank of Australia / Reserve Bank of New Zealand (RBA/RBNZ)Current Interest Rate: http://www.rba.gov.au/ and http://www.rbnz.govt.nz/

Always A Carry FavoriteOffering one of the higher interest rates in the major global markets, the Reserve Bank of Australia has always upheld price stability and economic strength as cornerstones of its long-term plan. Headed by the governor, the bank's board is made up of six members-at-large, in addition to a deputy governor and a secretary of the Treasury. Together, they work toward to target inflation between 2-3%, while meeting nine times throughout the year. In similar fashion, the Reserve Bank of New Zealand looks to promote inflation targeting, hoping to maintain a foundation for prices.

Both currencies have been the focus of carry traders, as the Australian and New Zealand dollars (AUD and NZD) offer the highest yields of the seven major currencies available on most platforms. As a result, volatility can be experienced in these pairs if a deleveraging effect takes place. Otherwise, the currencies tend to trade in similar averages of 30-40 pips, like other majors. Both currencies also maintain relationships with commodities, most notably silver and gold. (Read more about carry trades and the AUD in Turn To The Carry – A Different Flavor Of The Setup.)

8. South African Rand (ZAR)Central Bank: South African Reserve Bank (SARB)Current Interest Rate: http://www.reservebank.co.za/

Emerging OpportunityPreviously modeled on the United Kingdom's Bank of England, the South African Reserve Bank stands as the monetary authority when it comes to South Africa. Taking on major responsibilities similar to those of other central banks, the SARB is also known as a creditor in certain situations, a clearing bank and major custodian of gold. Above all else, the central bank is in charge of "the achievement and maintenance of price stability". This also includes intervention in the foreign exchange markets when the situation arises.

Interestingly enough, the South African Reserve Bank remains a wholly owned private entity with more than 600 shareholders that are regulated by owning less than 1% of the total number of outstanding shares. This is to ensure that the interests of the economy precede those of any private individual. To maintain this policy, the governor and 14-member board head the bank's activities and work toward monetary goals. The board meets six times a year.

Seen as relatively volatile, the average daily range of the South African rand (ZAR) can be as high as 1,000 pips. But don't let the wide daily range fool you. When translated into dollar pips, the movements are equivalent to an average day in the British pound, making the currency a great pair to trade against the U.S. dollar (especially when taking into consideration the carry potential). Traders also consider the currency's relationship to gold and platinum. With the economy being a world leader when it comes to exports of both metals, it is only natural to see a correlation similar to that between the CAD and crude oil. As a result, consider the commodities markets in creating opportunities when economic data is scant. (Read more about the rand in The New World Of Emerging Market Currencies.)

ConclusionAs financial markets continue to evolve and grow globally, foreign exchange and currencies will play an increasingly large role in day-to-day transactions. Notional volumes for the market sector are already averaging approximately $3 trillion per day. As a result, whether a conversion for physical trade or a simple portfolio diversification play, currencies continue to offer more opportunities to both the retail and institutional investor.

For more introductory reading on the forex market, check out Getting Started In Forex and Forex Basics: Setting Up An Account.