Architectural isolation is a cybersecurity practice where critical system components are separated from less secure or vulnerable networks through design strategies. This separation limits the potential attack surface and reduces the risk of unauthorized access or lateral movement by attackers. Techniques include network segmentation, use of demilitarized zones (DMZs), dedicated hardware, or virtualization to ensure that sensitive data and processes are protected from threats originating in less trusted environments. By isolating key assets, organizations can contain breaches, enforce stricter access controls, and enhance overall security posture. Architectural isolation is fundamental in high-security environments such as financial institutions, government, and cloud infrastructures.