Because the standard Telnet program allows you to either make a Telnet connection or just a raw TCP connection, the verb "to telnet" is often incorrectly used as a synonym for making a raw TCP connection. The actual Telnet protocol is more complicated than that, as you can see if you read the relevant RFCs and so on. That is what I think of Telnet.
>>4
He means that usually, the telnet executable can also serve the same purpose as netcat, even though that's not telnet at all, just a raw TCP connection.