Azure ExpressRoute lets you create private connections between Azure datacenters and infrastructure on your premises or in a colocation environment. ExpressRoute connections don't go over the public Internet. They offer more reliability, faster speeds, and lower latencies, and higher security than typical Internet connections. In some cases, using ExpressRoute connections to transfer data between on-premises systems and Azure can yield significant cost benefits.
With ExpressRoute, establish connections to Azure at an ExpressRoute location, such as an Exchange provider facility, or directly connect to Azure from your existing WAN network, such as a multi-protocol label switching (MPLS) VPN, provided by a network service provider.
ExpressRoute gives you a fast and reliable connection to Azure, making it suitable for scenarios like periodic data migration, replication for business continuity, disaster recovery, and other high-availability strategies. It can be a cost-effective option for transferring large amounts of data, such as datasets for high-performance computing applications, or moving large virtual machines between your Dev-Test environment in Azure and your on-premises production environment.
ExpressRoute lets you securely add compute and storage capacity to your existing datacenter. With high throughput and fast latencies, Azure will feel like a natural extension to your datacenter, so you enjoy the scale and economics of the public cloud without having to compromise on network performance.
With predictable, reliable, and high-throughput connections offered by ExpressRoute, build applications that span on-premises infrastructure and Azure without compromising privacy or performance. For example, run a corporate intranet application in Azure that authenticates users with an on-premises Active Directory service, and serve all corporate users without traffic ever routing through the public Internet.