EUR/USD is the currency pair of the United States dollar vs the euro, the shared currency of the Eurozone. USD and EUR are the most heavily-traded currencies in the world, covering more than half of the total trading volume in the Forex market. The currency pair indicates how many US dollars are needed to purchase one euro. For example, if the pair is trading at 1.35, it means you need 1.35 USD to buy 1 EUR. In CFD trading, your profit (or loss) is determined by reference to the price movement of the currency pair. You are not buying or selling the underlying asset.