These files can be in any form and can be found with search engines. E-mail is electronic mail through which users can exchange messages. Although normally e-mail messages are text, messages can include pictures or sound files. E-mail addresses of users can be readily attained through different search engines and online databases. The messages normally remain on the bulletin board for a limited time period.
Individuals search for the most appropriate bulletin board for the subject desired.
At a given site hundreds of messages will be posted about that subject. Messages can also be posted which are irrelevant to the subject. Messages can be text, programs, sound files, or pictures. It is an e-mail discussion group dedicated to a particular topic. Messages sent to the listserver are then broadcast out to all of the subscribers.