Can you explain what the Telnet protocol is and how it is used for remote connection?

Telnet is a network protocol that allows a user to connect to a remote computer and control it through a text interface. It operates over the TCP protocol and typically uses port 23.

When connecting via Telnet, the user receives a command line of the remote system and can execute commands as if working locally.

However, Telnet does not provide data encryption, so transmitted information (including passwords) can be intercepted. Because of this, it is replaced by a more secure protocol, SSH, in modern systems.

Example of usage:

telnet example.com 23

After connecting, login and password are entered to access the remote machine.