It is the central computer which processes the data in the central centralized processing type system like the mainframe & the system and personal computer communication, vis-a-vis the terminal unit and the input from the client. Pointing to the thing of the mainframe simply, there are also times when it calls "the host".
In addition, the computer which is connected to network in TCP/IP, is called all host computers. As for this as for TCP/IP, "the host and the terminal" not to be, you say that because it is derived from being researched interconnect of the computer namely as protocol in order to connect "the host and the host".
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