A server cluster is a group of physical or virtual servers that work together as a single unit. The cluster consists of several independent servers that share the workload and interact with each other to provide high availability, scalability, and reliability.

Server clusters can be used for processing large amounts of data, high-traffic websites, multi-user access applications, computational processes, and other tasks that require a significant amount of resources.

In a server cluster, each server may have its own copy of data and configurations that are synchronized with other servers in real-time to ensure high availability of data and services. If one server fails, other servers can take on its workload to ensure uninterrupted service.

Server clusters can be deployed on both local networks and cloud platforms. In cloud clusters, cloud service providers provide the infrastructure and resources for creating and managing the cluster, reducing the need for proprietary hardware and support.