IT security refers to the technical and administrative controls implemented to protect information technology systems, networks, and devices from cyber threats. In Australia, IT security is foundational to safeguarding business operations, customer data, and critical infrastructure. IT security measures include network firewalls, endpoint protection, intrusion detection systems, secure configuration management, and identity and access controls. Effective IT security also involves patch management, backup strategies, and employee awareness training to mitigate phishing risks. Aligning IT security practices with the ACSC Essential Eight and ISO 27001 strengthens protection against ransomware and data breaches. A comprehensive IT security program reduces downtime, limits financial loss, and ensures compliance with Australian regulatory requirements in an evolving threat landscape.