Forex trading involves the sale of a currency, and the simultaneous purchase of another with the purpose of closing the position at a later time with a profit. Unlike in the stock or commodities markets where prices are routinely quoted in USD, the price of a currency can be quoted in any other currency due to the essentially bartering nature of currency transactions where live, as well as historical, forex charts are used to identify trends and entry/exit points for trades.
Currencies are traded on the Foreign Exchange market, also known as Forex. This is a decentralized market that spans the globe and is considered the largest by trading volume and the most liquid worldwide. Exchange rates fluctuate continuously due to the ever changing market forces of supply and demand. Forex traders buy a currency pair if they think the exchange rate will rise and sell it if they think the opposite will happen. The Forex market remains open around the world for 24 hours a day with the exception of weekends.