A clan or guild is a group of players that form, usually under an informal 'leader' or administrator. Clans are often formed by gamers with similar interests; many clans or guilds form to connect an 'offline' community that might otherwise be isolated due to geographic, cultural or physical barriers. Some clans are composed of professional gamers, who enter competitive tournaments for cash or other prizes; most, however, are simply groups of like-minded players that band together for a mutual purpose (for example, a gaming-related interest or social group).