Discussion boards provide a forum on which visitors to your site can converse about topics of interest. SharePoint sites created with the Team, Document Workspace, or Social Meeting site templates include a discussion board. You can display the discussion board by using the Quick Launch for the Team and Document Workspace sites or the Discussion tab on Social Meeting workspaces.
You can use a discussion board to initiate new discussions as well as sort and filter existing discussions. You can also change the design of the discussion board and create alerts that notify you of changes to the discussion board.