PCI DSS, or Payment Card Industry Data Security Standard, is a set of security guidelines created to protect credit card data and prevent fraud. It’s a mandatory standard for any business that accepts credit card payments, and compliance is enforced by major credit card companies. PCI DSS outlines requirements for maintaining a secure network, protecting cardholder data, and regularly monitoring and testing security systems. Adhering to PCI DSS helps businesses build customer trust, reduce the risk of data breaches, and avoid costly fines and penalties.