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Telnet basically allows you to log in to a system over a network just as though you were logging in from a terminal attached to the system or from a dial-up modem.
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You may use telnet from a command line such as:
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> telnet nova.npac.syr.edu
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where you give the internet name of the machine that you wish to connect to. The telnet service will proceed to ask you for a name and password just as if you were logging in.
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Or you may have a telnet program which prompts you for the same information.
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Between two unix systems, you can use the rlogin command instead.
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Mostly, you must already have an account on the machine to log in. There are a few publicly available telnet machines, such as the FAA Flight Service at duats.gtefsd.com, where student pilots can log in to get the latest weather data.
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