この記事はまだボランティアによって 日本語 に翻訳されていません。ぜひ MDN に参加して翻訳を手伝ってください！
IRC (Internet Relay Chat) is a worldwide chat system requiring an Internet connection and an IRC client, which sends and receives messages via the IRC server.
Designed in the late 1980s by Jarrko Oikarinen, IRC uses TCP and is an open protocol. The IRC server broadcasts messages to everyone connected to one of many IRC channels (each with their own ID).