This is a program that allows you log in to a Unix computer via a text-based interface. If you have an account on a Telnet server, you can access certain resources on the system such your home directory, your e-mail account, FTP files, etc. The downside of Telnet is that, to use it, you need to use Unix commands, which can be a challenge.
This page contains a technical definition of Telnet. It explains in computing terminology what Telnet means and is one of many Internet terms in the TechTerms dictionary.
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