MasterCard, Visa, American Express, JCB, Discover, and Diners Club International are globally recognized credit card networks offering secure and convenient payment options. Here’s a brief overview of each:

1. MasterCard and Visa: These widely accepted cards facilitate transactions by connecting cardholders, merchants, and banks. When a purchase is made, the issuer (cardholder’s bank) pays the merchant through the card network, and the cardholder repays the bank.
2. American Express (AmEx): Known for premium services and rewards programs, AmEx cards are issued directly by American Express, which acts as both the issuer and network. They often come with higher fees but offer exceptional customer service and benefits.
3. JCB (Japan Credit Bureau): A leading credit card issuer and acquirer in Japan, JCB cards are accepted in many countries, particularly in Asia. JCB offers various rewards and services, focusing on customer satisfaction and security.
4. Discover: Popular in the United States, Discover cards are known for cashback rewards and no annual fees. Discover operates its own network, providing direct customer service and maintaining competitive interest rates.
5. Diners Club International: One of the original charge card companies, Diners Club is now a part of Discover Financial Services. These cards are accepted worldwide, especially at travel and entertainment-related businesses, and offer exclusive benefits and services.

Each of these networks processes payments by facilitating communication between the merchant and the cardholder’s bank, ensuring secure and efficient transactions. They offer various features like rewards programs, fraud protection, and extensive acceptance to meet diverse consumer needs.