ExpressRoute is a service provided by Microsoft Azure that allows users to create private connections between their on-premises networks and the Azure cloud. This connection does not go over the public internet, which enhances security and reliability. It is ideal for businesses that require consistent performance and low latency for their applications. With ExpressRoute, organizations can extend their data centers into the cloud while maintaining control over their data. This service supports various bandwidth options, making it flexible for different business needs. Additionally, it can be used for disaster recovery and backup solutions, ensuring data availability and resilience.