Contextual advertising is the term applied to advertisements appearing on websites which ads are served by automated systems based on the content of the page.
Since the advent of AdSense, the Yahoo Publisher Network, MSN adCenter and others have been gearing up to make similar offering.
Contextual advertising has made a major impact on earnings of many websites. As the ads are more targeted they are more likely to get clicked, thus generating revenue for the owner of the website (and the server of the advertisement). A large part of Google’s earnings are from their share of the contextual ads served on the millions of webpages running the Adsense program.
- MSN Ad Center news article
- Contextual Advertising Sandbox Compare Ads served by Google Adsense, Chitika and Yahoo Publisher Network