What Does Mailing List Mean?
A mailing list is a compilation of email addresses that are used to send email to multiple users simultaneously. Rather than individually sending an email to each user, mailing lists send email to specific user groups through a single email message.
Techopedia Explains Mailing List
A mailing list is usually composed of email addresses of subscribers to a website/service/business and/or emails collected through offline or manual means. It usually consists of only the names and email addresses of individuals. Mailing lists are generally used as a means to share content, news and any product- or service-related information with subscribers.