Group discussions
Course groups can have their own discussion boards. Group discussion boards are available only to users who are members of the group. If a group discussion board is available, you can find it in the My Groups section and on the group homepage.
More on finding your groups
In the Original Course View, group discussion boards are separate from the regular course discussion board. Members of a group can create and manage their own forums. Instructors can choose to grade group discussions, but each member is graded individually.
More on forums