An AAID identifies an app instance running on a smart mobile device. It can be accessed only by that specific app instance. An AAID remains valid throughout the app installation period. Compared with device-level hardware IDs that cannot be reset, AAIDs offer improved privacy.
It is the default notification message type. If you have not applied for the message self-classification permission, messages pushed by your app are categorized as news and marketing messages by default. Such messages are displayed only in the notification panel (under the More notifications section) in gentle notification mode.