AdSense

 is a program run by GOOGLE. that allows publishers in the Google Network of content sites to serve automatic text, image, video, and rich media adverts that are targeted to site content and audience. These adverts are administered, sorted, and maintained by Google, and they can generate revenue on either a or-IMPRESSION basis. Google a - service, but discontinued it in October 2008 in favor of a  offering (also owned by Google). In Q1 2011, Google earned US $2.43 billion ($9.71 billion annualized), or 28% of total revenue,