An application protocol that was originally designed to allow a user to log-in to a remote host over a network. The word is a a contraction of Telecommunication-Network. Telnet is normally used to provide a command-line interface to a remote host and is a very simple protocol. Characters are sent from the user's keyboard to the remote server and echoed back in a console window for display in the client's user agent (usually a terminal emulator). Telnet uses port 23 to communicate with the server daemon process telnetd. Because telnet exchanges its messages in plain-text (including logins and passwords), Many ISPs prohibit the use of telnet on the grounds of security. They require instead the use of the secure shell protocol (user agent ssh and server sshd) which encrypts all data sent to and received from the server. Telnet was developed in 1969 beginning with RFC 15 and standardized as IETF STD 8 and is therefore one of the first Internet standards. You can read more about telnet on Wikipedia.

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