Adobe Audience Manager

For some traits, I'm seeing that the unique visitor volume in Audience Manager is as low as 50% of the volume that we're seeing in Adobe Analytics. Is that normal or does that seem to low? I know that AAM doesn't accept visitors with 3rd party cookies, so I'm sure the discrepancy varies by industry....

Hello,I'm starting to use Audience Manager and I’ve some questions about it. Can you guys help me please?What the real concept of Traits? What is the difference between Traits and Segments? Traits are more specifc and Segments "global"?I've an eVar at Adobe Analytics that uniquely identifies  users....