The pop up appears while you are browsing through the website. This means that you have the option to click on it if you are interested or you may choose to ignore it if they are selling items that you do not like that much. The pop-under on the other hand is something that will appear when you try to close the present website that you are browsing through.
This is the one that you will get when you try to get rid of landing page that sells supplements or other items that are meant to improve your body overall. Pop-ups and pop-unders can be annoying at times but companies have to use this in order to enhance the chances that they will be seen by their target market.
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