Credit Card Networks are systems that facilitate electronic payments between consumers, merchants, and banks. They provide the infrastructure that allows credit card transactions to occur, ensuring that funds are transferred securely and efficiently. Major networks include Visa, Mastercard, American Express, and Discover, each with its own rules and fees. When a consumer uses a credit card, the network processes the transaction by communicating with the merchant's bank and the cardholder's bank. This process involves verifying the card's validity, checking available credit, and authorizing the payment, allowing for a smooth purchasing experience.