Pop Under is more or less like Pop Ups, with the only and main difference that they open in different browsers that come underneath the browser where the publisher’s site is opened. It is due to this setting of appearance, they are considered less intrusive and disturbing. Only after a person is through with reading the publisher’s site and closes it, the viewer then comes to know about your products and services, when he or she is more relaxed and can divert their attention towards what you have to say. And it is because of this psychology, Pop Unders also enjoy good click through and conversion rates.

These ads fit the user’s screen size, just like the Pop up Ads. The formats that are accepted for such ads are .gif, .html and flash. You can use pop under ads for filling up some form or for branding purposes. The performance of a Pop Under ad can be measured by the click throughs and impressions generated.