These are special interest electronic discussion groups.
Information is exchanged via email and the same message goes to all people who are on the list.
Hence the term List Serve. Listservs can also be called mailing lists or discussion groups. The list address - to send message to people on the list. To join a listserv, send an email message to the administrative address . It is a good idea to join one listserv to begin with as they can generate a lot of email.