ISO 27001 Annex A is a crucial component of the internationally recognized ISO/IEC 27001 standard for Information Security Management Systems (ISMS). It provides a comprehensive catalogue of 93 information security controls, organized into four themes: Organisational, People, Physical, and Technological controls. These controls are not mandatory in their entirety; rather, organizations select and implement relevant controls based on their specific risk assessment and treatment process, as documented in their Statement of Applicability. Annex A serves as a practical reference guide, helping organizations to identify and apply appropriate measures to protect the confidentiality, integrity, and availability of their information assets, thereby addressing a wide array of potential security threats and vulnerabilities.