A List is the way that you can differentiate messages and subscribers from others in your AWeber account. Lists are useful if you are managing multiple businesses or mailing lists, as each list can have its own unique company branding.
After setting up your account , your first list will already be created. The branding for this list can be updated, and new lists can be created as needed.
Note: If you’re simply looking to target groups of subscribers on your list, tags and segments are typically a better option than creating a new list.