What is the difference between a pop-up and pop-under ad?
A.
A pop-up ad appears when you open a Web site; you do not see a pop-under ad until you close your current browser window.
B.
A pop-up ad uses a separate window; a pop-under ad does not.
C.
A pop-up ad is a click-and-order ad; a pop-under ad is considered a click through ad.
D.
A pop-under ad is a type of spyware; a pop-up ad is not.