Cluster Computing consists of loosely coupled systems that interact, work, and perform operations as a single system. The various cluster nodes are connected via LAN (Local Area Network). Cluster computing ensures scalability, speed, resource management, and continuous availability of computing power. Clusters are of two types: Open and closed. Open clusters are those through which nodes can be accessed only via the Internet. In closed clusters, the nodes are hidden and secure. Each cluster computer consists of cluster nodes, cluster operating system, switches, and network-switching hardware.