Inside your html, you can specify sections of your page that you want to emphasis for Google adsense, and other parts that you wish adsense to ignore.
This is great if you find that inappropriate ads are being shown based on certain text, say in your footer.
Quote:
The HTML tags to emphasize a page section take the following format:
<!-- google_ad_section_start -->
<!-- google_ad_section_end -->
You can also designate sections you'd like to have ignored by adding a (weight=ignore) to the starting tag:
<!-- google_ad_section_start(weight=ignore) -->
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