CPI, commonly known as a full page ad is one of the most demanding services in online advertising. Interstitial are web pages that are displayed before an expected content page. Ads created by advertiser are displayed as the interstitial page before the actual web page in the publisher site. Unlike typical interstitial ads, here the admin has the option to set the time for displaying interstitial ad pages and followed by a "skip through" option, ensures that the ads are seen by public. Income generated from the CPI is based on impressions. Both administrator and publisher are credited for each impression.