An Email list group is one whereby members only use Email to communicate. This group type is common in organizations where a single email alias is desired to communicate to a certain group of people using email.
An Web forum group is one whereby members only use the Google Groups user interface to communicate with other members. This group type is similar to the online web forums found on many web sites.
A Question and Answer (Q&A) forum group is one whereby members use the Google Groups user interface to primarily answer the questions of other members. This group type is similar to the online help forum.
A collaborative inbox allows members of a group to manage the workflow state of topics within the group. These groups have specific features and permissions set. If you choose to not use these features, they will need to be disabled individually.
Set basic permissions
The Basic permissions section contains the most fundamental permissions for a group. These permissions are presented when creating a group or by clicking on the Manage button within the Topics screen, expanding the Permissions section on the left-hand side, and clicking on Basic Permissions. Refer to Understanding permissions for information on permissions in Google Groups. Basic permissions follow:
Click on this menu if you want to change who can read group posts. By default, Anyone (members and non-members) can view a group’s content.
Click on this menu if you want to change who can post messages to the group. By default all members of a group can post to the group.
A public group is a group where anyone can contribute to group topics and posts but only members can create new topics and post. Public groups are also open for anyone to join.
Join the group
Click on this menu if you want to change how people join the group. By default, Anyone can ask to join a group, requiring a user with administrative permissions to approve each new member.