As casas de câmbio are financial institutions that specialize in exchanging one currency for another. They are commonly found in airports, tourist areas, and major cities, providing services for travelers and businesses. Customers can buy or sell foreign currencies, often at rates that vary from bank rates. These establishments typically charge a fee or offer a different exchange rate to cover their costs. It's important for customers to compare rates and fees before making a transaction to ensure they get the best deal. Many casas de câmbio also offer additional services, such as travel insurance and prepaid travel cards.