Answer
Zero trust security is a model that requires all users and devices to be authenticated, authorized, and continuously validated before accessing resources, regardless of location or network. It operates on the principle that all access requests require verification regardless of source, eliminating implicit trust even for internal users or systems.
This approach replaces the traditional idea that anything inside an organization's network is safe. Instead, every access request is treated as untrusted until proven otherwise. Access is granted based on identity, device health, and context, with policies enforced dynamically. This reduces the risk of lateral movement by attackers who have breached the perimeter.