Online advertising frequently involves both a publisher, who integrates advertisements into its online content, and an advertiser, who provides the advertisements to be displayed on the publisher’s content.
Pay per View (PPV) networks pay legitimate publishers to add what looks like a standard ad tag to their sites. When users go to the publisher’s site, the tag triggers other publisher sites to display in a way that’s invisible to users — typically via pop-unders
Below you can find a interesting (and bit nerdy) technique for PPV