Telnet - Wikipedia
https://en.wikipedia.org/wiki/Telnet
Telnet is an application protocol used on the Internet or local area network to provide a bidirectional interactive text-oriented communication facility using a virtual terminal connection.
How to Use the Telnet Client in Windows
https://www.lifewire.com/what-is-telnet-2626026
Nowadays, Telnet can be used from a virtual terminal, or a terminal emulator, which is essentially a modern computer that communicates with the same Telnet isn't the same as other TCP/IP protocols such as HTTP, which transfers files to and from a server. Instead, the Telnet protocol has you log on...