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.Chat messages are generally short in order to enable other participants to respond quickly.Ancestors include network chat software such as UNIX "talk" used in the 1970s.
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.
To make or receive a video call, you need an app — either one that comes with your phone or one you download separately. If you and the person you want to engage each have an i Phone or i Pad, you can rely on Apple’s Face Time for video calls.
Just open the Face Time app and tap on the name of the person you want to call, or tap on the name of someone in your Contacts list and tap on the video icon.
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.