A chat room, chatroom, or group chat (GC), is an online technology of synchronous conferencing, and occasionally even asynchronous conferencing. Chat rooms comprise technology ranging from real-time online chat and online interaction with strangers (e.g., online forums) to fully immersive graphical social environments. The ability to converse with multiple people in the same conversation differentiates chat rooms from instant messaging programs.
The first chat system was developed by Murray Turoff and for its first by the US government in 1971. Talkomatic, the first public online chat system, was created in 1973 on the PLATO System. Chat rooms gained mainstream popularity with AOL, and many peer-to-peer clients were created to host chat rooms. Further innovations include visual chat rooms, which add graphics to the chat experience.