Zero-trust architecture in cybersecurity focuses on the principle of "never trust, always verify." This model requires strict identity verification for every user, device, and application attempting to access resources, regardless of whether they are inside or outside the network perimeter. By assuming that threats could originate from both internal and external sources, zero-trust architectures aim to minimize the risk of unauthorized access and data breaches. Implementing this approach involves continuous monitoring of user activity, enforcing granular access controls, and segmenting networks to enhance security.