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Different bots behave differently. Some follow links, others tranverse site structures. Some follow robot.txt rules, others don't. Some use the content declared within meta tags, others don't.
Essentially, descriptive elements such as comments help in situations when meta tags don't apply or the page is purely flash (not exclusively, since I'm sure there are other scenarios when this is applicable)
Users won't see them on the page, but can read the listing/summary on search engine results.
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"90% of the game is half mental."
--Yogi Berra
Elizabeth Arden
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