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Azure Site Recovery (ASR) provides a disaster recovery as a service solution for Hyper-V, VMware, and physical servers, using either Azure or your secondary datacenter as the recovery site. ASR can be a key part of your organization’s business continuity and disaster recovery (BCDR) strategy by orchestrating the replication, failover, and recovery of workloads and applications if the primary location fails.

While there are many attractive technical features to ASR, there are at least two significant business advantages:

 ASR enables the use of Azure as a destination for recovery, thus eliminating the cost and complexity of maintaining a secondary physical datacenter.

 ASR makes it incredibly simple to test failovers for recovery drills without impacting production environments. This makes it easy to test your planned or unplanned failovers. After all, you don’t really have a good disaster recovery plan if you’ve never tried to fail over.

The recovery plans you create with ASR can be as simple or as complex as your scenario requires. They can include custom PowerShell scripts, Azure Automation runbooks, or manual intervention steps. You can leverage the recovery plans to replicate workloads to Azure, easily enabling new opportunities for migration, temporary bursts during surge periods, or development and testing of new applications.

Source of Information : Microsoft Azure Essentials Fundamentals of Azure Second Edition