The Forex market is an international Over-The-Counter Market (OTC). This means that it is a self-regulated market without a central exchange or meeting place. Unlike stocks and futures markets, where you have The New York Stock Exchange- a physical location where traders can track, buy and sell stocks.
There are many differences between the Forex market and the Stock market. One major difference is the number of trading alternatives available. In Stocks, you have thousands to choose from, where as in Forex, there are very few.