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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:
Order used
Query parameter (collection method)
post_visid_type column value
Present when
vid  s.visitorID  
 is set.
aid   s_vi cookie  
Visitor had an existing s_vi cookie before you deployed the Visitor ID service, or you have a Visitor ID  grace period  configured. 
 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 .