Identifying Unique Visitors
The method for identifying unique visitors among multiple contexts includes a prioritized sequence to ensure accuracy in this determination. The following table shows this prioritized sequence:
Query parameter (collection method)
post_visid_type column value
Visitor's browser accepts cookies (first-party), and the Identity Service is deployed.
Visitor's browser accepts cookies (first-party).
Device is recognized as a mobile device.
Visitor's browser does not accept cookies.
For information on how unique visitors are reported, see Unique Visitors in Analytics .