AdSense income. They do this in three ways:[citation needed]

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1. They use a wide range of traffic-generating techniques, including
but not limited to online advertising.
2. They build valuable content on their websites that attracts AdSense
advertisements, which pay out the most when they are clicked.
3. They use text content on their websites that encourages visitors to
click on advertisements. Note that Google prohibits webmasters from
using phrases like "Click on my AdSense ads" to increase click rates.
The phrases accepted are "Sponsored Links" and "Advertisements".The
source of all AdSense income is the AdWords program, which in turn has
a complex pricing model based on a Vickrey second price auction.
AdSense commands an advertiser to submit a sealed bid (i.e., a bid not
observable by competitors). Additionally, for any given click
received, advertisers only pay one bid increment above the second-
highest bid.

http://greatsivagoogleadsense.com/

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