Pop-under

Pop-under refers to a type of online advertising strategy where a new browser window is automatically opened behind the current active window. Unlike pop-up ads that appear over the webpage content and can be immediately intrusive, pop-unders are designed to be less obtrusive by remaining hidden until the user closes or minimizes the active window. This way, the advertisement in the pop-under window is revealed, potentially capturing the user’s attention without interrupting their browsing experience.