Forex is the largest financial market. Around $4 trillion is traded around the world every day. In many ways, this is the market that is easiest for an investor to master.
Forex, or FX, means currency exchange. You sell one currency, such as pounds sterling, and buy another, such as US dollars.
When buying currency at a bank or a currency exchange office, you see two prices: the purchase price and the sale price. The currency exchange works in a similar way. She sets one price, at which she is ready to sell you US dollars, and the second, at which she is ready to buy them from you.