Contextual Link Advertising

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.