Microsoft Azure ExpressRoute lets you create private connections between Azure datacenters and infrastructure that’s on your premises or in a co-location environment. With ExpressRoute, you can establish connections to Azure at an ExpressRoute partner co-location facility, or directly connect to Azure from your existing WAN network (such as a MPLS VPN provided by a network service provider). Use ExpressRoute to extend your network to Azure and unlock hybrid IT scenarios.
ExpressRoute connections offer higher security, more reliability, faster speeds and lower latencies than typical connections over the Internet. In some cases, using ExpressRoute connections to transfer data between your on-premises network and Azure can also yield significant cost benefits. If you already have created a cross-premises connection from your on-premises network to Azure, you can migrate to an ExpressRoute connection while keeping your virtual network intact.