ISO 27001 is the international standard for information security management systems (ISMS). Published by ISO/IEC, it defines requirements for establishing, implementing, maintaining, and continually improving an ISMS. The 2022 revision includes 93 controls across four themes: organisational, people, physical, and technological. Certification requires an accredited external audit demonstrating that the ISMS meets all clause requirements and that selected Annex A controls are implemented and effective. Acuna supports the full ISO 27001 lifecycle from scoping through audit preparation.