A listserv enables people to regularly communicate with large numbers of people who have similar interests. There are thousands of listservs on every topic imaginable. For example, there are listservs that discuss plants, pets, automobiles, rentals, educational issues and a multitude of other topics. Blue Web'n, Inclass and the Scout Report are popular educational listservs. Anyone can subscribe to one or more listservs.
Members send mail to the listserv and the mail is then distributed to all of the subscribers.
In this way, a finite group of people can engage in discussion on topics that are relevant only to them. Listservs enable people to receive, read and reply to e-mail that is delivered to everyone who has subscribed to the mailing list. The list of subscribers is maintained on a server. When messages are received by the server or posted , the server e-mails the messages to all of the subscribers on the list. In order to subscribe to a listserv, you must send an e-mail message to the listerv's administrator.