Currency is the system of money used by a country for buying goods and services. Different countries use different currencies, and each currency has its own name, symbol, and value. Currencies are important for trade, travel, and international business. Exchange rates determine how much one currency is worth compared to another. The US Dollar (USD) is one of the most widely used currencies in the world. It is the official currency of the United States and is commonly used in international trade and finance. Many countries hold US dollars as part of their foreign exchange reserves. The Euro (EUR) is used by many countries in Europe that belong to the Eurozone. Introduced in 1999, it became one of the world's most important currencies. The Euro helps simplify trade and travel among participating European countries. The Japanese Yen (JPY) is the official currency of Japan. It is one of the most traded currencies in foreign exchange markets. Japan's strong economy has helped make the yen an important global currency. The British Pound Sterling (GBP) is the official currency of the United Kingdom. It is one of the oldest currencies still in use today. The pound remains a significant currency in international finance. The Indian Rupee (INR) is the official currency of India. It is managed by the Reserve Bank of India. As India's economy has grown, the rupee has become increasingly important in regional and global trade. Other major currencies include the Chinese Yuan (CNY), the Canadian Dollar (CAD), the Australian Dollar (AUD), and the Swiss Franc (CHF). These currencies play important roles in global commerce and financial markets. Understanding major world currencies helps people engage in international trade, tourism, investment, and business activities. Currency values can change over time due to economic conditions, government policies, and market demand.