A pop-under is an advertisement that hides behind your browser window, revealing itself only when you leave the site you're visiting.Īnother example of aggressive online advertising is the rise of third-party trackers and ads that 'follow' you across the Internet as you browse. So now there are not only pop-ups, there are also pop- unders. Over the years, pop-up ads have become more aggressive in order to get past ad blockers like AdBlock. Other names may be trademarks of their respective owners.Blocking Pop-Ups, Pop-Unders, and Trackers The Android robot is reproduced or modified from work created and shared by Google and used according to terms described in the Creative Commons 3.0 Attribution License. Microsoft and the Window logo are trademarks of Microsoft Corporation in the U.S. Alexa and all related logos are trademarks of, Inc.

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