Currency is a system of money that is used to buy and sell goods and services. It can come in various forms, such as coins, paper bills, or even digital money. Different countries have their own currencies, like the US Dollar in the United States or the Euro in many European countries. Currency helps people trade easily without having to barter or exchange items directly. The value of currency can change based on supply and demand, economic conditions, and other factors. People often exchange currencies when traveling to different countries, using services like currency exchange to convert their money. Understanding currency is essential for managing personal finances and participating in the global economy.