It automates the delivery of messages to a group of people that are subscribed to the mailing list. A list can be for a specific product such as Word or it can be by subject area such as a list for an online class. It provides an opportunity to share information.
People can signup and signoff automatically.
Dozens, hundreds, and even thousands of individuals can be subscribed to a list. Message are automatically forwarded as soon as they're received. This allows for timely dissemination of information and interaction between list members. For example, if it is appropriate, rather than an open subscription for anyone, subscription can be set so approval is necessary from a list's owner. Thousands of discussion groups exist and they can provide dialog with other professionals in an employee's field.