The first online chat system was called Talkomatic, created by Doug Brown and David R.
Woolley in 1973 on the PLATO System at the University of Illinois.
Ancestors include network chat software such as UNIX "talk" used in the 1970s.
The term chatiquette (chat etiquette) is a variation of netiquette (Internet etiquette) and describes basic rules of online communication.
Online chat may refer to any kind of communication over the Internet that offers a real-time transmission of text messages from sender to receiver.