The User Acquisition Network tab under Display Traffic contains a list of ad networks identified as sending traffic to the analyzed domain. The Ad networks will be listed by percentage of traffic being sent through the given Ad Networks within the selected time frame. A user can also active the competitive traffic share by comparing additional websites to understand which competitors are using the same Ad Networks.
A user can identify the Ad Networks sending traffic to a given site by looking at User Acquisition Networks under Display Traffic. Toggle between different date ranges to see how new or existing Ad Networks have been sending traffic to the selected site.
For more information, see Display Traffic Overview.