Groups are private, individualized, and discreet areas of Bungie.net that are separate from the main public forums. Groups are divided into two categories: chapters and bungie.net clans.
Clans are user-created groups on Bungie.net that are linked to an online gaming clan. Bungie.net clans provide a place for clan members to discuss upcoming online-meetings or tournaments and/or to discuss clan-related issues, and strategies.
Chapters are user-created groups on Bungie.net. Unlike bungie.net clans, chapters are not linked to a specific clan but rather are designed to provide a place to associate with bungie.net peers in a more intimate setting. They allow members to converse in their own private forums, organize events, and post articles, news, and many more features. Chapters may center on specific topics of discussion or might be "FFA" (free for all) chapters where anything goes.
Bungie.net clans and Chapters are a large and, some might say, integral part of the 7th Column.
During the 2007 Bungie.net website update, Chapters were taken offline for maintenance. After being absent from b.net for nearly a month and a half, Groups returned to the site on May 2, 2007 to the astonishment and delight of the Bungie Community.
An open chapter is a chapter on bungie.net that does not restrict its membership. Unlike a private chapter, anyone can join an open chapter.
A private chapter is a chapter on bungie.net that restricts its membership. Unlike an open chapter which anyone can join, prospective private chapter members must be approved by an already-existing chapter member or administrator with the appropriate level of security privileges.