IRC

Internet Relay Chat (IRC) is a form of communication on the Internet that was created for interpersonal communication, especially communication in place of a discussion group called the channel (the channel), but also can be used for private line communications.
IRC was created by Jarkko Oikarinen (nickname "Wiz") at the end of August 1988 to replace the BBS program called Mut (multiuser talk), in Finland called OuluBOX. Oikarinen found inspiration Bitnet Relay Chat which operated on the Bitnet network. He made an IRC client and IRC server at the University of Oulu, Finland (At the time he worked in the Department of Information Science). Now, the IRC has been used in more than 60 countries around the world.

When we use the Internet Relay Chat, we will be greeted by the Message of the Day (Order Today) or motd which contains information about the site and traffic on the network. When using IRC, users are asked to name the nickname or pseudonym. The user has a program (called a "client") to connect you to an IRC server from one of the nets mentioned above.
Source : www.wikipedia.com