A dedicated server is a powerful computer that is used solely as a network server; a single computer in a network reserved for network needs. It refers to the rental and exclusive use of a computer and it provides services for only one account or domain name. Dedicated server hosting is typically required for a web site or a group of related company sites that develop a substantial amount of traffic.

Server Cluster - A server cluster is a group of independent servers running and working together as a single ystem to provide high availability of services for clients. When a failure occurs on one computer in a cluster, resources are redirected and the workload is redistributed to another computer in the cluster. You can use server clusters to ensure that users have constant access to important server-based resources.

Server clusters are designed for applications that have long-running in-memory state or frequently updated data. Typical uses for server clusters include high traffic sites, file servers, print servers, database servers, and essaging servers.