This book undertakes the challenge of untangling the enigma of audit by deconstructing its definition by functional approach. A recurring theme underlying audits is the demand it surfaces in environments characterized by lack of trust and by calling for accountability and transparency. Audits materialize when resources are entrusted, yet trust remains elusive and necessitates restoration. The catalyst for audits emerges as external agents—auditors—who intervene to rectify inherent trust deficits. The underlying conundrum lies in effectively assessing risk within various application contexts for personal data protection. It’s crucial to delineate that “audit” should not be indiscriminately interchanged with terms like “verification,” “validation,” “certification,” or “assessment”. The “control revolution” underscores the transformative impact of technology on organizations. Audits encounter management and legal challenges in their role as regulatory entities for personal data protection. The audit system connects the function of management control and legal control internally and externally. The goal of audit extends to assisting organizations in better achieving compliance objectives, necessitating comprehensive audit coverage across the data lifecycle, and play a crucial role in audit effectiveness, especially through external auditors’ role in responding to internal audit processes for external stakeholders and the public