The invitation list is an automatically generated list of all of the people you sent an eCard to with the event response form link. This is your ’mailing’ list which contains information on whether the person picked up your eCard and whether they responded to your invitation. Even if you send multiple eCard invitations, the one consolidated invitation list enables you to easily further correspond with the people you invited.
The guest list contains people who have responded to your event. Some of these people may not be on your original 'invitation list' because a person on your invitation list included them as their guest, or the invitation was forward to them, or they responded by clicking a 'direct link' to the event response form.