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Search engines like google or other text-link advertising networks have expanded their network distribution to include contextual-inventory. Contextual or content inventory is when listings are displayed on pages of Web sites (usually not search engines), where the written content on the page indicates to the ad-server that the page is a good match to specific keywords and phrases. Google's Adsense(TM) advertising network generates a significant amount of traffic through contextual (not google search) inventory.
An advertising program run by Google. Website owners can enroll in this program to enable text and image advertisements on their sites. These ads are administered by Google and generate revenue on a per-click basis.
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