How does a credict card number look like?

A credit card number typically consists of 16 digits, arranged in four groups of four digits each (e.g., 1234 5678 9012 3456). The first digit indicates the card network (e.g., Visa starts with a 4, MasterCard with a 5). Following the card number, there is usually an expiration date and a three-digit CVV code on the back. The entire configuration is designed for security and identification purposes.