Cyber security involves protecting systems, networks, and data from cyber threats, unauthorised access, and malicious attacks. In Australia, cyber security is guided by the ACSC Essential Eight, the Privacy Act, and sector-specific regulations such as APRA CPS 234. Cyber security includes risk assessments, access control management, encryption, vulnerability management, and incident response. As cybercrime continues to increase, Australian organisations must adopt structured governance frameworks to ensure compliance and resilience. Effective cyber security integrates technical controls with board-level oversight, enabling measurable risk reduction and improved decision-making. Strong cyber security practices protect sensitive data, safeguard business operations, and enhance stakeholder confidence.