Azure's service for creating private, high-speed connections between your on-premises networks and Microsoft's cloud. Like having a private tunnel that connects your office directly to Azure data centers.
A hospital uses ExpressRoute to securely connect their patient management systems to Azure while meeting strict healthcare compliance requirements.
All four services provide private, dedicated connectivity from on-premises or colocation facilities into the provider’s network, improving reliability and often reducing latency versus public internet VPNs. They differ mainly in port speeds, partner ecosystems, routing options (BGP), and pricing models.