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mainframe

A central unit is a large, powerful and expensive computer, used mainly by a large company for the processing of a large amount of data

pc

is important him serve.

designed in principle to be used by one person

server

A server is a running application capable of serving a client's requests and returning a response accordingly.

workstations

server is a computer running a NOS. Most of today's desktop operating systems include networking capabilities and allow multi-user access.