Warcraft 3 is the third in the Warcraft series by Blizzard, the maker of games such as Diablo and Starcraft. Warcraft III is a real-time strategy game with some RPG elements in it.
Only submit sites for Warcraft III - Reign of Chaos to this category. Sites for The Frozen Throne need to go in its specific category.
A clan and/or guild is a group of players that have formed a sort of team to play a multiplayer version of a game. They often play together, helping each other to improve. Clans often compete against each other, whether informally, as an impromptu match, or in organized leagues and tournaments.
Some clans are open and always looking for new players, others require you to be invited from a member. Clan members often put a "tag" in their player name, with a combination of symbols and letters, to indicate which clan they are a part of.
These are clans focusing on WarCraft III and resources relating to clans and clan events.