The currency market or currency market, also known by experts as Forex, English abbreviation of Foreign Exchange, is a global investment market. The currency market is the largest in the world in terms of daily trading value, and certainly the oldest in the history of man.
http://es.dailyforex.com/forex-articles/2011/02/Mercado-de-monedas-hoy-una-buena-inversión-financiera/7288