Exchanges are platforms where people can trade goods, services, or currencies. For example, in a stock exchange, investors buy and sell shares of companies, hoping to make a profit. Similarly, in a currency exchange, travelers can convert their money into different currencies to use in other countries. In the digital world, cryptocurrency exchanges allow users to trade digital currencies like Bitcoin and Ethereum. These exchanges provide a marketplace for buying, selling, and swapping cryptocurrencies, making it easier for people to invest in this new form of money. Overall, exchanges play a crucial role in facilitating trade and investment.