Payment security on a credit card involves protecting the cardholder’s personal and financial information during transactions. This includes fraud prevention measures like data encryption, tokenization, authentication processes (like PIN numbers or biometric scans), strong access controls, complying with industry standards like PCI DSS, and using technologies, such as Europay, Mastercard, and Visa (EMV) chips. The goal is to prevent unauthorized access to cardholder data and reduce the risk of fraudulent transactions.