What Analytics feature allows the association of custom identifiers with individual customers across different platforms?

The feature that allows the association of custom identifiers with individual customers across different platforms is User-ID. This functionality enables businesses to create a persistent user identity that can track users as they interact with various digital platforms, such as websites and mobile apps. By implementing User-ID, organizations can analyze user behavior across devices, ensuring that they have a complete picture of user engagement and interactions.

User-ID is particularly useful for understanding user journeys and obtaining a holistic view of how customers navigate through your services. This is essential for developing tailored marketing strategies and improving user experiences based on comprehensive data.

Other options like Account Linking, Custom Dimensions, and Data Import serve different purposes. Account Linking primarily connects different Google accounts and services, Custom Dimensions provide additional data attributes tied to events or user properties, and Data Import allows for adding offline or other data into Google Analytics for deeper insights. While all these features have their unique benefits, none directly associate custom identifiers with individual users across platforms in the way User-ID does.