The name Telnet comes from “telephone network,” which is how most Telnet sessions normally occur.
Telnet is the most useful of all protocols—its specialty is terminal emulation.
It helps and allows a user on a remote client computer, called the Telnet client, to access
the resources of another computer, the Telnet server.
Telnet achieves this by pulling a fast one on the Telnet server and making the client computer appear
as though it were a terminal directly attached to the local network. This projection
is actually a software image, a virtual terminal that can interact with
the chosen remote host.
These emulated terminals are of the text-mode type and can execute
refined procedures like displaying menus that give users the opportunity to
choose options from them and access the applications on the duped server.
Users begin a Telnet session by running the Telnet client software and then
logging on to the Telnet server.