- Person: an individual in our database
- SubscriberParticipant: a Person who is subscribed to one or more Subscription Listsa Person who has 1 or more mobile interactions (e.g., sent a text message, downloaded an app) with the brand but has not yet subscribed to a Subscription List
- Pending Subscriber: a Person who a Participant who has been sent a prompt to join a a Subscription List, but has not replied "Y"
- Subscriber: a Participant who is subscribed to one or more Subscription Lists
- Subscription List: a collection of Subscribers that have all subscribed to the same type of certain content.
- Recipient List: an externally defined set of People who match the target for outbound content delivery