Google Anthos is a comprehensive hybrid and multi-cloud management platform designed for modern Kubernetes (K8s) deployments. It enables organizations to deploy, manage and secure Kubernetes clusters across the Google Cloud Platform (GCP), on-premises data centers, and other public clouds — all through a unified interface
Why organizations adopt Anthos
Many enterprises run Kubernetes clusters in mixed environments: some in Google Cloud, some on-premises, and others in multi-cloud setups. Managing these clusters separately can be time-consuming, error-prone and operationally complex. Anthos addresses this by providing a single control plane to manage clusters everywhere.

What Anthos brings to the table
Policy & configuration management: Using tools like Anthos Config Management, you can define policies once and apply them consistently across all clusters (hybrid and multi-cloud) as shown in the picture above
Unified infrastructure management: Whether clusters live in GCP, your data center or another cloud, you can view and control them from one console.
Service-mesh support: Anthos leverages Istio (via Anthos Service Mesh) to manage, monitor and secure microservices across clusters and clouds. Techzine.nl+1
In the GCP Console (or via API/CLI), once you enable Anthos, it will show see options to register K8 Clusters in various environments:

Summary, Google Anthos provides a unified platform to manage, secure, and operate Kubernetes clusters across on-premises, Google Cloud, and multi-cloud environments using a consistent set of tools and service-mesh capabilities.
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