I know you”ve seen the text boxes on numerous websites — you know, the ones that say “Ads by Google” (or “Ads by Goooooogle”). These text ads are a neat, effective way for advertisers to match their advertising money to their target audience.

Google”s Adsense and Adwords programs are a contextual advertising system — Google varies the advertising based on the text content of a particular web page. When a web “publisher” puts up a new page with Google Adsense code, Google”s advertising engine determines in real-time which ads to present on the page.

Usually this initial determination is based on the domain and the web page”s file name. For example, a hypothetical web page www.terryshometheater.com/dvd-players.php would have its initial Adsense ads based on the words: home, theater, dvd and player. Google”s advertising engine is smart enough to parse the domain name and file name, although you can help it with dashes and underscores, if you wish.

Original article posted to blog.TerrysComputerTips.com

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