Compliance testing is a type of security assessment used to evaluate and validate compliance with regulatory requirements, industry standards, and security best practices. It involves assessing adherence to specific security controls, policies, and guidelines mandated by regulations such as GDPR (General Data Protection Regulation), HIPAA (Health Insurance Portability and Accountability Act), PCI DSS (Payment Card Industry Data Security Standard), and ISO/IEC 27001 (Information Security Management System). Compliance testing helps organizations demonstrate compliance, mitigate risks, and avoid legal penalties associated with non-compliance.