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Internet Relay ChatA form of instant communication over the Internet. It is mainly designed for group (many-to-many) communication in discussion forums called channels, but also allows one-to-one communication.Internet users anywhere in the world can 'chat' with each other by sending text messages via IRC. When combined with an IRC client program that displays a list of the current IRC channels (chat sessions), the user can watch what other users are typing on-screen and respond as desired. Internet relay chat is "real-time" communication, so users must be logged in to the Internet at the same time.