When a visitor visits a page of your site with an Adsense tag, there is a piece of JavaScript that writes an I-frame tag which includes the URL of the page. Adsense currently employs JavaScript in incorporating the advertisement into your site. The Adsense' servers utilize a cache of the page for the URL to establish a set of high-value keywords. If those keywords are already cached, the advertisement that uses such keywords is served based on the Adwords bidding system. For instance, your website generates 2 billion visitors every day and they have all clicked 10 Adsense tags in your site, the system will serve around 10 billion requests everyday. Suppose these 20 billion requests per day generates a click-through rate of 0.2 percent at $0.10, then Adsense will receive 20 million clicks per day, generating an average of $2 million per day, or an average of $60 million per month.

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