All users of the IRC channel are expected to follow the Code Of Conduct
Many of the [MusicBrainzBio MusicBrainz developers], as well as other users who want to chat with them, can be found on the #musicbrainz channel at irc.freenode.net (irc://irc.freenode.net/musicbrainz). References to IRC on the Wiki generally refer to this channel. As in many communities the chatters in the channel have developed their own MusicBrainz Slang. Also, you may want to take a look through IRC Regulars to find out who's who on IRC.
There is a weekly Monday dev chat in the #musicbrainz-devel channel at irc.freenode.net that takes about an hour. It usually starts at 8pm UK, 9pm mainland Europe, 3pm EST or noon PST. Check the Developers Mailing List for an invitation.
Internet Relay Chat is a type of instant messaging network; you will need an IRC client to participate, but even without one, you can browse the IRC logs (there is only an extremely crude chronological index by days, but you can also look at today's log and yesterday's log).