PCI DSS compliance checklist: What businesses need to know

This guide explains PCI DSS v4.0: who must comply, the four merchant levels, the 12 core requirements grouped into themes (network security, cardholder data protection, vulnerability management, access control, monitoring, and governance), a practical compliance checklist, steps to validate compliance, common mistakes, and how PCI compares to other frameworks; it emphasizes that compliance is not equivalent to complete security.