A Linux cluster is a group of interconnected Linux-based computers that work together as a single system to improve performance, reliability, and scalability. Clusters can be designed for high availability, ensuring system uptime by providing redundancy, or for high performance, distributing tasks across multiple nodes for faster processing. Common types of Linux clusters include load-balancing clusters, high-performance computing (HPC) clusters, and failover clusters. Cluster management involves configuring shared resources, synchronizing nodes, and monitoring the cluster to ensure efficient operations and optimal resource utilization. Linux clusters are widely used in data centers, scientific research, and enterprise environments.