An exchange is a marketplace where people can buy and sell goods, services, or financial assets. These platforms facilitate transactions between buyers and sellers, often providing a structured environment to ensure fairness and transparency. Examples of exchanges include stock exchanges like NYSE and NASDAQ, where shares of companies are traded. In addition to financial markets, exchanges can also refer to systems for trading commodities, such as grain exchanges or commodity exchanges. They can also encompass digital platforms, like cryptocurrency exchanges, where users trade digital currencies. Overall, exchanges play a crucial role in the economy by enabling trade and investment.