What does Google Analytics Dynamic Re marketing use to show website visitors ads for content they previously viewed?

Google Analytics Dynamic Remarketing leverages two primary data sources to personalize ads. First, it uses hit and session attributes collected via the data layer. The data layer is a JavaScript object that holds information about the page and user, which GTM then pushes to Analytics. This allows for detailed tracking of viewed products, categories, or other content. Second, it utilizes user information from the Analytics cookie. This cookie stores a unique identifier for the user, enabling Analytics to recognize returning visitors and associate their past browsing behavior with their current session. Products the user has +1’d in Google Plus is outdated and not a current mechanism. Hit and session attributes collected from Google Ads are used for Google Ads remarketing, but Analytics Dynamic Remarketing primarily relies on Analytics data.