Question

What is telnet internet service

Answer 1

Telnet is a network protocol used to virtually access a computer and to provide a two-way, collaborative and text-based communication channel between two machines

Answer 2

A terminal protocol usually running on TCP port 23.

Step-by-step explanation:

With a telnet client, you can connect to a system and execute shell commands, usually on (but not limited to) a unix type of system.

Since telnet is a simple text-based character-in character-out protocol, it is also possible to telnet to a web server or a mail server (services that are not on port 23), and issue the same commands as a browser or mail client would.