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 an Azure virtual private cloud 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.