Zero Trust Network Access (ZTNA) is a modern approach to access control that makes an organization’s protected resources more secure from cyberattacks. It recognizes that a 0-day flaw or stolen password can compromise a network at any time, and hackers exploit these footholds by using lateral movement techniques. ZTNA's strength lies in its ability to prevent lateral movement and minimize an attack's blast radius. Traditional security approaches try to block lateral movement but fail; instead, ZTNA uses software-defined perimeters (SDPs) to make resources invisible from compromised networks, reducing the opportunities for breach. Micro-segmentation creates a granular network structure that enhances security by hiding each microsegment's structure, limiting exposed resources on a compromised segment, and limiting users to authorized segments. SDP systems can redraw the secure perimeter around each resource, turning it into its own microsegment, and companies no longer need vulnerable VPN gateways or DMZs. ZTNA solutions evaluate device posture and controls, such as firewall, antivirus, lock screen, encryption, and biometric security, to define least-privileged access rules. Implementing ZTNA can reduce the attack surface further by limiting users' access to authorized resources after a social engineering attack.