Which Google Analytics feature lets you associate your own identifiers with your individual customers so you can connect their behavior across different interactions on various devices and platforms?
Correct Answer
User-ID
Why is this the correct answer?
The feature is User-ID. It lets a business send its own persistent identifier — typically the internal account ID for a signed-in customer — with the events it collects, so activity from the same person on a phone, a laptop and an app can be joined into one user journey rather than counted as three separate users. That materially changes reporting for any business with logins: user counts become more accurate, cross-device paths to conversion become visible, and retention analysis reflects people rather than browsers. Two rules matter in practice. The identifier must be consistent for the same person across platforms, and it must not contain personally identifiable information such as an email address, so businesses send a hashed or internal ID rather than anything that identifies the individual directly.
Why are the other options wrong?
Predictive audiences
Predictive audiences group users by modelled likelihood of a future action, such as purchasing or churning. They do not join identities across devices.
Device ID
Device ID identifies a single device or browser instance, which is exactly the limitation User-ID overcomes.
Audience triggers
Audience triggers fire an event when a user joins an audience. They are unrelated to cross-device identity.
Real-world example
A banking app implements User-ID with hashed customer numbers. Reporting reveals that most applications start on mobile and are completed on desktop days later — journeys that previously appeared as two unrelated users, making mobile campaigns look far less effective than they were.
Topics in this question
About the Google Analytics Certification (GA4)
The Google Analytics Certification tests your understanding of GA4: how data is collected through events, how accounts, properties and data streams fit together, and how to use standard reports, explorations and audiences to answer business questions.
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