The most common currencies in the world are widely used in international trade and financial markets. The US dollar is the most traded and is considered the world's primary reserve currency. It is followed by the euro, the unified currency of the European Union, which is characterized by economic strength and political support. The Japanese yen ranks third and is widely used in Asia. The British pound maintains its historical position as a strong currency. The importance of the Chinese yuan is also increasing with the growth of the Chinese economy. These currencies affect the prices of commodities, investments, and monetary policies around the world, playing a pivotal role in the stability of the global economy.