Azure Arc is a set of technologies that extends Azure management and services to infrastructure located on-premises, in multiple clouds, and at the edge. It allows users to organize and govern assets, deploy and manage Kubernetes applications at scale across environments, and deploy and manage data services anywhere while maintaining centralized security and governance from Azure. Key benefits include a unified view of assets, configuration and deployment using infrastructure as code, automated updates and patching, elastic scaling on-premises, and consistent security across locations.