Modern monetary systems are far superior to the barter system people used in the old days. Inefficiency and lengthy negotiation were the main reason the barter system became obsolete. Later, bronze, silver and gold came to be used as mediums of exchange in trade.

Globally, currency trading is a major business, and it is estimated that over US$2 trillion is traded everyday. The system of currency trading is also referred to as foreign exchange, Forex, or FX for short. The currencies traded have a relative value to other currencies. The trading uses the purchase and sale of large quantities of currency to leverage the shift in order to earn profit.

Fluctuation in the relative value of a currency is caused by two reasons. The first reason being the \"real\" market, i.e. in case a foreigner wants to buy a commodity, he is forced to convert his domestic currency into the currency of the visiting place, the currency also fluctuates as it leaves a state.

Speculation is another factor on which the currency fluctuates. The heavy buying and selling in the market can drastically impact the value of the currency. This speculation has been responsible for drastic consequences on the national currency, consequently hampering the growth of a country\'s economy.

Analysts also consider online currency trading a very \"fast market\" which is highly volatile. An individual has to take into account technical and fundamental data and make an informed decision based on his perception of forex futures trading market sentiments and market expectations to become a successful trader. One of the variables that is most important in currency trading is timing. The trader has to be aware of the happenings in the market, and also has to understand the nuances of the market to play safely.

Banking conglomerates and large multinationals were the movers and shakers in trading before small investors entered into the market and changed the face of the industry. Although professional help is usually needed before individuals or companies start currency trading, an individual with good understanding of business can also try his luck in the practice.