Zero trust architecture is a cybersecurity approach that assumes no user, device, or network is inherently trustworthy, even if they are inside the organization's perimeter. Instead of granting broad access based on location or credentials alone, zero trust requires continuous verification of every user and device attempting to access resources. This model uses strict identity checks, least-privilege access, and real-time monitoring to minimize risks from both external attackers and insider threats. By verifying every request, zero trust architecture helps protect sensitive data and systems in an increasingly complex digital environment.