Mailing lists allow you to send emails to multiple recipients in one go. This feature is very useful when you need to send a newsletter or another update to a group of people.
Creating a mailing list in cPanel:
cPanel allows you to create mailing lists in several clicks:

Public: subscriptions are open
Private: the administrator must approve subscriptions
Click on Add:

Once done, you will see a message about the successful mailing list creation.
Managing mailing lists
All the mailing lists you've created can be found in the
Current Lists section: