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Telnet is an old network protocol and application that allows a user to access and control a remote computer from a different device, using a simple text-based, or command-line interface. It works on a client-server model and uses the TCP/IP protocol to establish a connection, but it is not secure because it transmits data, including usernames and passwords, in plain text, unlike its modern successor, Secure Shell (SSH).

What Telnet is

A protocol and application: Telnet is both the set of rules (protocol) for communication and the software (application) that uses those rules.

Remote access: It enables users to connect to a remote machine and interact with it as if they were sitting at a local console.

Text-based: Communication is done through a virtual terminal connection, using text commands and responses.

How it works: A Telnet client on one computer connects to a Telnet server on another computer. The server listens for incoming requests on a specific port, typically port 23. Once the connection is established, the client sends commands to the server, and the server sends back the results.