Place Cisco Secure Web Appliance S398 hardware at the internet egress point to apply web-security controls to user web traffic. The appliance format gives network and security teams a dedicated platform for the web gateway role, separating web access policy from endpoint systems and general-purpose infrastructure. The S398 belongs in deployments where outbound browsing requires centralized inspection and control before traffic reaches internet destinations. It can sit alongside perimeter security infrastructure as the web-focused control point for employee, contractor, and managed-device internet access. This role is relevant for sites that need consistent handling of web requests instead of relying solely on browser settings or endpoint-based controls. WSA-S398-K9 identifies the Cisco Secure Web Appliance S398 hardware orderable. Select this model when the required platform designation is S398 and the deployment calls for a physical Cisco web-security appliance. Interface count, storage configuration, throughput, installed software releases, and subscription entitlements should be matched to the organization’s web gateway architecture before deployment. The hardware model designation matters when standardizing platform selection, maintaining installed appliance fleets, or replacing an existing S398 system.