When it comes to trading foreign currency, you use a forex broker, also known as a currency trading broker, to place your trades. When you trade forex, you buy or sell in currency pairs, e.g. "EUR / USD" (Euro / U.S. Dollar). You open an account, deposit funds, then use the broker's trading platform to buy and sell currency using margin. Forex markets are open 24 hours a day, five days a week. For learning the basics, we recommend the School of Pipsology or the NFA's Trading Forex booklet.