IRC

IRC is an acronym for "Internet Relay Chat".

WoW has been described as an RPG wrapped around an IRC client because so many of its slash commands and chat concepts are lifted from IRC (including, some would say, the atmosphere). The syntax for emotes, joining and parting a channel, and ignore are all familiar to IRC users.

For more information about IRC, go to irchelp.org.

UI channels
The Wowpedia channel is not the best place to ask UI questions - we suggest the following:
 * WoWUIdev - chat.freenode.net, #WoWUIDev - for UI development questions.
 * WowAce - chat.freenode.net, #wowace - for Ace questions.
 * Dongle - chat.freenode.net, #dongle - a small embeddable framework for addon developers.
 * Cosmos - irc.datavertex.com, #cosmostesters - for Cosmos questions.
 * Norganna - chat.freenode.net, #norganna - for Norganna's addons questions.

Geekshed IRC (irc.geekshed.net)

 * #WoW_Chat - For World of Warcraft general chat.

Freenode (irc.freenode.net)

 * #wowpedia - users of this wiki! =)
 * #lua - Lua users
 * #wowuidev - Addon developers
 * #wowace - Ace developers
 * #dongle - Dongle developers
 * #wowhead - Wowhead users!
 * #norganna - Norganna's AddOns users.
 * #wowtech - Unofficial Live technical support.

MMOIRC (irc.mmoirc.com)

 * #omfg - OMFG hang-out
 * #WorldofWarcraft - general WoW discussion
 * List of current channels

Data Vertex (irc.datavertex.com)

 * #cosmostesters - Cosmos users

GameSurge (irc.gamesurge.net)

 * #chromaggus-pvp - Players on the Chromaggus server
 * #dalvengyr - Players on the Dalvengyr Realm

Blitzed (irc.blitzed.org)

 * #wow - Horde Players on Icecrown and Alliance on Muradin

EnterTheGame (irc.enterthegame.net)

 * #wwchat - Players on Whisperwind Realm
 * #dalvengyr - Players on Dalvengyr Realm

Quakenet (irc.quakenet.org)

 * Ahn'Qiraj Europe - irc.quakenet.org, #ahn'qiraj - Ahn'Qiraj Europe
 * Al'Akir Europe - irc.quakenet.org, #alakir - Al'Akir Europe
 * Darksorrow Europe - irc.quakenet.org, #darksorrow - Darksorrow Europe
 * Dunemaul Europe - irc.quakenet.org, #dunemaul - Dunemaul Europe
 * Draenor Europe - irc.quakenet.org, #draenor - Draenor Europe
 * Vashj Europe - irc.quakenet.org, #vashj - Vashj Europe
 * Emeriss Europe - irc.quakenet.org, #emeriss - Emeriss Europe
 * Executus Europe - irc.quakenet.org, #Executus - Executus Europe
 * Kor'gall Europe - irc.quakenet.org, #kor'gall - Kor'gall Europe
 * Machinima - irc.quakenet.org, #Machinima - Discussion of machinima, mostly Warcraft.
 * Quel'Thalas Europe - irc.quakenet.org, #quel'thalas - Quel'Thalas Europe
 * Silvermoon Europe - irc.quakenet.org, #eu-silvermoon - Silvermoon Europe
 * Stormrage Europe - irc.quakenet.org, #stormrage-europe - Stormrage Europe
 * Trollbane Europe - irc.quakenet.org, #Trollbane - Trollbane Europe
 * WoW.fr - irc.quakenet.org, #wow.fr - for French WoW players.
 * Vashj FM - irc.quakenet.org, #vashjfm - Vashj Europe's very own online radio station
 * Cynical Brit - irc.quakenet.org, #cynicalbrit - cynicalbrit IRC.
 * MMO-Champion - irc.quakenet.org, #mmo-champion - MMO-Champion IRC.

Stratics (irc.stratics.com)

 * Executus US - irc.stratics.com, #executus - Executus US
 * Thrall US - irc.stratics.com, #thrall - Thrall US

Rizon (irc.rizon.net)

 * #bleedinghollow - Players on Bleeding Hollow Realm

Other

 * Stonemaul Europe - irc.lv, #wow.stonemaul - Stonemaul Europe