Yahoo! Groups is one of the world’s largest collections of online discussion boards. The term Groups refers to Internet communication which is a hybrid between an electronic mailing list and a threaded Internet forum, in other words, Group messages can be read and posted by e-mail or on the Group's webpage like a web forum. In addition, members can choose whether to receive individual, daily digest or Special Delivery e-mails, or simply read Group posts on the Group's Web site. Groups can be created with public or member-only access. Some Groups are simply announcement bulletin boards, to which only the Group moderators can post, while others are discussion forums.