What is the term used to describe an ad that appears after you close your current browser window?

Question

Quizplus · Accepted Answer

A pop-under ad is an advertisement that opens up in a new browser window underneath the current window, so it becomes visible only when the user closes or minimizes the current window. This type of ad is considered intrusive as it appears when the user is leaving a website, but it can still capture attention and generate clicks. AdWare is a type of software that displays ads on a user's device without their consent or knowledge, while E-marketing ads and online/banners ads are displayed within the current browser window.

What Is the Term Used to Describe an Ad That