User-ID views and Cross Device reports [Legacy]
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A User-ID view is a special reporting view that only displays data from sessions in which you send User-ID data to Analytics, so you can analyze the segment of traffic with an assigned ID separately from your other traffic.
The Cross Device reports give you the tools you need to organize User-ID data across multiple devices and sessions into a cohesive analysis. The Cross Device reports are only available in User-ID views.