Gold is a form of currency. The internationally accepted code for gold is XAU which is a symbol used under the ISO 4217 currency standard to denote one troy ounce of gold. It is known to be a “safe-haven” asset, expected to increase its value in times of volatility and economic uncertainty.
The XAU/USD pair tells the trader how many US Dollar (the quote currency) are needed to purchase one Gold Ounce (the base currency). The United States is the country that holds the biggest resources of gold in the world.