Tracking users across different devices is becoming increasingly important in today’s digital world. This is especially true for businesses that want to understand their customers better and provide them with the best possible experience. To do this, companies need to be able to identify users across different devices, which requires a User ID.

User IDs are unique identifiers that allow a company to track the same user across multiple devices. It can be anything from an email address or phone number, to a username or even a device ID. With the right User ID in place, companies can gain valuable insights into their customers’ behaviour and preferences which they can use to improve their products and services.

Q: What is required for User ID to track users across different devices?

A) Sign-in that generates and sets unique IDs
B) Google Tag Manager
C) A new Analytics account for reporting
D) All of the above

Correct Answer is A) Sign-in that generates and sets unique IDs.


The User ID enables the association of one or more sessions (and any activity within those sessions) with a unique and persistent ID that you send to Analytics. To implement the User ID, you must be able to generate your own unique IDs, consistently assign IDs to users, and include these IDs wherever you send data to Analytics. For example, you could send the unique IDs generated by your own authentication system to Analytics as values for the User ID. Any engagement, like link clicks and page or screen navigation, that happen while a unique ID is assigned can be sent and connected in Analytics via the User ID.

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