In cluster computing, multiple computers (often referred to as nodes) are linked together to operate as a single system. They share resources such as storage and processing power while functioning independently. The cluster can handle both high-performance computing (HPC) applications and high-availability configurations, where redundancy is crucial for system reliability. The nodes in a cluster can be homogeneous (identical) or heterogeneous (different configurations). Techniques such as load balancing and parallel processing allow tasks to be split among the nodes, enabling faster computation and resource utilization.