A clan is a group of Jarls that work together. Clan members cannot attack each other. There are two types of clans: regulated and open. Regulated clans can only be joined by invitation or if the clan accepts a request to join. Open clans can be joined by anyone. Jarls in a clan can be given different Ranks.
Clans are a very important part of the game. If a Jarl is not in a clan, they cannot take part in clan or global events.
Members of a clan can help each other by sending resources through the Market building. Clanmates can also click the help button, which boosts building or knowledge upgrades by either 1% or one minute, depending on which one speeds up the process more.
Many developed clans in the game have a Stronghold.
There are multiple Clan Competitions. Down here they are listed: