The webmaster inserts the Ad Sense JavaScript code into a webpage.
Each time this page is visited, the JavaScript code uses in lined JASON to
display content fetched from Google's servers.
For contextual advertisements, Google's servers use a cache of the page to
determine a set of high-value keywords. If keywords have been cached already,
advertisements are served for those keywords based on the Ad Words bidding system.
(More details are described in the AdSense patent.)
For site-targeted advertisements, the advertiser chooses the page(s) on which to display
advertisements, and pays based on cost per mille (CPM), or the price advertisers choose
to pay for every thousand advertisements displayed
For referrals, Google adds money to the advertiser's account when visitors either
download the referred software or subscribe to the referred service.
The referral program was retired in August 2008.
Search advertisements are added to the list of results after the visitor performs a search.
Because the JavaScript is sent to the Web browser when the page is requested, it is possible for other
website owners to copy the JavaScript code into their own webpages. To protect against this type of fraud,
AdSense customers can specify the pages on which advertisements should be shown. AdSense then ignores
clicks from pages other than those specified.
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