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.
As an example, it is considered rude to write only in upper case, because it appears as if the user is shouting.
The word "chatiquette" has been used in connection with various chat systems (e.g. Writing is changing as it takes on some of the functions and features of speech.
Online chat in a less stringent definition may be primarily any direct text-based or video-based (webcams), one-on-one chat or one-to-many group chat (formally also known as synchronous conferencing), using tools such as instant messengers, Internet Relay Chat (IRC), talkers and possibly MUDs.
The expression online chat comes from the word chat which means "informal conversation".
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.These conventions or guidelines have been created to avoid misunderstandings and to simplify the communication between users.Chatiquette varies from community to community and generally describes basic courtesy.It offered several channels, each of which could accommodate up to five people, with messages appearing on all users' screens character-by-character as they were typed.Talkomatic was very popular among PLATO users into the mid-1980s.There is no download or registration needed to chat (there is an option for registration so you can keep a name anytime when chatting online).