a computerized "bulletin board." People subscribe to the listserv, which usually focuses on a subject, such as wildlife control. There are two types: open listservs, and moderated ones. In the open ones, when someone posts a message to the "bulletin board" (the listserv) it's immediately sent to everyone, often as an email message. Others can then respond to the message. If there's a moderator, messages are sent to that person, who then decides whether or not to post them for the whole group, and if they need editing.