A server is a computer system integrated into a computer network with an associated operating system that serves clients or houses servers (in the form of software). A hardware-based server (also called a host) is a physical device with an integrated computer network on which the operating system runs and one or more software-based servers also run.
In addition to complex computing units with dedicated operating systems, specialized systems of network devices such as routers and print servers can also be called servers. Since servers are usually permanently in operation, processors, main memory and storage solutions designed for continuous operation are preferably used in the corresponding computers. To further increase the reliability of servers, these computers are specially designed for redundancy and have, for example, several main processors, storage solutions in RAID configuration or redundant power supplies.
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