Mailing list refer to a list of personal emails, rather than postal mail, that are organized by specific topics. The system that sends out the emails to individuals is automated. Users sign up to receive emails on a specific subject are called subscribers. When new emails are to be sent out the automated system sends out the information to the subscribers. It has become a favored way for people to stay up to date with subjects they like. Many companies have seen this trend grow and have begun using mailing list as a way to keep there customers current on events, discounts and more.