Popunders are another form of online advertising on the Internet which emerged from the concept of pop-ups. This form of advertising is mostly acceptable to all parties' advertisers, publishers and users as they are less intrusive and doesn't interrupt the user immediately nor take the user away from the publisher site. It gives advertisers a good opportunity to brand their product as well as giving the users sufficient product information. It can also provide advertisers with no creativity to use any page within their website as a popunder advertisement.

When a user visit one of website with popunder advertisements, the popunder will open up in a new browser window hidden under the user's current browser. When the user closes their current browser then they will notice the pop-under advertisement making them less intrusive, more acceptable to users and won't take visitors away from the publisher's website.

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