The currency (foreign exchange) market is the largest and oldest financial market in the world. It is also called the foreign exchange market, or "FOREX" or "FX" market for short. It is the biggest and most liquid market in the world with daily average turnover of US$1.9 trillion, and it is traded mainly through the 24 hour-a-day inter-bank currency market - the primary market for currencies.
Foreign Exchange simply means the buying of one currency and selling another at the same time. In other words, the currency of one country is exchanged for those of another. The currencies of the world are on a floating exchange rate, and are always traded in pairs
There are two reasons to buy and sell currencies. About 5% of daily turnover is from companies and governments that buy or sell products and services in a foreign country or must convert profits made in foreign currencies into their domestic currency.
The other 95% is trading for profit, or what you call speculation. Investors frequently trade on information they believe to be superior and relevant, when in fact it is not and is fully discounted by the market.
Unlike the futures and stock markets, trading of currencies is not centralized on an exchange. Forex literally follows the sun around the world. Trading moves from major banking centers of the U.S. to Australia and New Zealand, to the Far East, to Europe and finally back to the U.S.
Currency Symbol / Currency Pair
EUR/USD = Euro / US Dollar
GBP/USD = Pounds Sterling/ US Dollar
USD/JPY = US Dollar / Japanese Yen
USD/CHF = US Dollar / Swiss Franc
USD/CAD = US Dollar / Canadian Dollar
AUD/USD = Australian Dollar / US Dollar
NZD/USD = New Zealand Dollar / US Dollar
Etc.
In excess of 85 percent of all daily transactions involve trading of the major currencies - Australian Dollar, British Pound, Canadian Dollar, Japanese Yen, Swiss Franc, and the U.S. Dollar.
Currencies are traded in pairs, meaning that you are really trading one currency for another. A simple way to understand this is to consider what you do when you go on foreign vacations. If you are an USA, and you plan to travel to another country, say Canada, then you might take say $10,000 USD to the bank to change it for Canadian dollars. Let’s say the exchange rate is 1.4000, then for your $10,000 USD they would give you $14,000 CAD. Now let’s say you didn’t spend the money and upon coming home you decide to change it back to USD currency. Now let’s say the exchange rate is 1.3700 (a change of 300 pips that could happen in a week), so your $14,000 CAD would convert back to $10,218.97 US. Therefore you just made $218.97, a 2.19% increase in funds.
Reading a FOREX quote may seem a bit confusing at first. However, it's really quite simple, when you see Forex quotes you will actually see two numbers. The first number is called the bid and the second number is called the offer/ask. If we use the USD/JPY as example 115.37/115.40 the first number 115.37 is the bid price and is the price traders are prepared to buy USD against the JPY. The second number 115.40 is the offer price and is the price traders are prepared to sell the USD against the JPY.
Here in USD/JPY the currency listed first (USD) is the base currency and & the value of the base currency is always 1. A quote of USD/JPY 115 means that one U.S. dollar is equal to 115 Japanese yen. When this currency quote goes up, it means the dollar has appreciated in value and the other currency has weakened. If the USD/JPY quote increases from 115 to 117, it indicate dollar is stronger because it will now buy more yen than before.