Cloaking and Doorway Pages

Cloaking is a technique wherein the page that the search engine spiders crawl through is different from the one we display to actual human visitors. To achieve this, we must either detect the IP address or User Agent of the visitor requesting the page to differentiate between person and spider. So, in essence, we give the search engine exactly what it likes (i.e., lots of relevant content, rich in keywords, etc.) which most of the time is terribly messy and not even readable. But they’ll rank very well because the design specifically caters to the search engine’s preferences. But, when a human visitor comes to the site, we will simply direct them the proper pages which obviously will contain AdSense.