IRC is a graphic-interface worldwide "party line" protocol that allows a number of users to exchange text messages within a group or privately in real time. The protocol gained notoriety during the 1991 Persian Gulf War and during the coup against Boris Yeltsin in September 1993 when the system was used to provide minute-to-minute, up-to-date reports on those situations.
IRC is a multi-user chat system originally written by Jarkko Oikarinen in 1988 as a replacement for the text-based talk and chat programs.
IRC users run a client program (usually called 'irc') on one of various IRC networks each with its own selection of channels, often numbering in the hundreds. Each channel is controlled by an operator, and each user identified by a nickname.
IRC networks are in a constant state of evolution. WebChat include representations of users via graphics and Global Chat adds sound clips.