Physical security refers to the measures and controls implemented to protect physical assets, such as hardware, networks, and data storage devices, from unauthorized access, damage, theft, or destruction. This involves securing facilities through barriers, surveillance, access controls, and environmental safeguards like fire suppression and climate control. Effective physical security ensures that only authorized personnel can access critical infrastructure, thereby safeguarding sensitive data and maintaining the integrity and availability of information systems. It is a fundamental aspect of a comprehensive data security strategy, complementing digital security measures.