Wiktionary
n. (alternative form of webchat English)
Wikipedia
A web chat is a system that allows users to communicate in real time using easily accessible web interfaces. It is a type of Internet online chat distinguished by its simplicity and accessibility to users who do not wish to take the time to install and learn to use specialized chat software. This trait allows users instantaneous access and only a web browser is required to chat. Users will always get the latest version of a chat service because no software installation or updates are required.
Usage examples of "web chat".
Langdon had never seen any evidence of the pendant, nor could he imagine how it could possibly reveal the Holy Grail, and yet Grail aficionados still discussed it ad nauseum on Internet bulletin boards and worldwide-web chat rooms.