Hi,
Thank you for reaching out to Adobe Community.
You can make use of Marketing Cloud Audiences.
Marketing Cloud Audiences provides the ability for Adobe Marketing Cloud solutions to communicate and share information about website visitors so the same data can be used by each solution.
Please see the doc below for more on this.
https://marketing.adobe.com/resources/help/en_US/target/a4t/c_mmp.html
Hope this helps!