ExpressRoute is a Microsoft Azure service that assists in provisioning private connections from your on-premise infrastructure to Microsoft Azure Datacentres. ExpressRoute connections do not go over the public Internet, and offer higher security, reliability, and speeds with lower latencies than typical connections over the Internet.
Although your Azure DataCentres can be accessed over the internet using a traditional IPSec VPN, Azure ExpressRoute provides some key benefits. These benefits include; a higher level of security, more reliability and lower latency.
ExpressRoute gives you a fast and reliable connection to Azure, making it excellent for periodic data migration, replication for business continuity, disaster recovery and other high-availability strategies. With predictable, reliable and thorough connections offered by ExpressRoute, you can build applications that span on premises infrastructure and Azure without compromising privacy or performance.