How does adobe technically track a return visit?

[roser11]

Would love a deep dive on this if at all possible; is this using a cookie? Are there any ramifications to privacy / GDPR legislation, and new browser standards (safari et al) that might prevent the successful identification of a return visit?

I'm sure an article exists on this somewhere but wasn't able to find it. Thank you! 

[leocwlau]

Adobe has an entire section on the "Adobe Experience Cloud Identity Service", https://experienceleague.adobe.com/docs/id-service/using/home.html?lang=en, which is how Adobe persistent ID identifies visitors.

[VinayC]

Create two segments -

1. New Visit - where visit = 1 (equals to 1)
2. Return Visit - where visit is greater than 1

compare the segments (as dimensions) for a given time period using any number of metrics as a report in your workspace.

[Benjienen]

Hi Roser, it includes non-cookied visitors:

Return visits: The number of visits where visit number is greater than 1. The Return Visits report includes non-cookied visitors. -Source: Compare Return Visits and Visit Number greater than 1 (adobe.com)