This Analytics feature allows you to connect individual customers' behaviour across various interactions on different platforms and devices by letting you associate your own identifiers with your individual customers.

User ID is correct because it allows you to associate your own persistent, non-personally identifiable IDs with individual users and send these IDs to Google Analytics. This enables a more accurate, unified view of the user journey across different devices and sessions, as Analytics can stitch together hits from the same user even if they use multiple devices. Predictive audiences use machine learning to identify users likely to convert or churn, but don't connect cross-device behavior. Audience triggers are events that cause a user to be added to an audience, not a cross-device tracking mechanism. Device ID refers to an identifier for a specific device, not a user across devices.