Telnet

from: (link to:) lifewire.com: "Telnet is a network protocol that provides a command-line interface to communicate with a device. Telnet is used most often for remote management but also sometimes for the initial setup for some devices, especially network hardware such as switches and access points."
(from: (link to:) computerhope.com): Telnet is: "A terminal emulation that enables a user to connect to a remote host or device using a telnet client, usually over port 23. For example, typing telnet hostname would connect a user to a hostname named hostname. Telnet enables a user to manage an account or device remotely. For example, a user may telnet into a computer that hosts their website to manage his or her files remotely. In the image is an example of a telnet session. As can be seen from this example, a telnet session is a command line interface."
(from: (link to:) techtarget.com): "Telnet is a user command and an underlying TCP/IP protocol for accessing remote computers. Through Telnet, an administrator or another user can access someone else's computer remotely."
Telnet can be used by a computer to execute commands as if it were operating a terminal CLI on another computer. This protocol is insecure and easily hacked. As a result, SSH is the preferred (secure) method to do such things, and telnet is generally only used for initial device setups (like WinLink).
Using Telnet:

requires a "Telnet client" software
may also require "enabling" telnet on your computer

for example, you can telnet into your router to control it or set parameters...
from cli: Run netstat -a -n.
Check to see if the specific port is listed. If it is, then it means that the server is listening on that port.

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