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Richard is right. It's a way to classify threads that go beyond just the forum they are in. There's a tag search function so that you can find other posts with the same tag. You can put tags on your threads or add them to anyone else's. A lot of other sites use tags like Technorati, Flickr, Blogger, LiveJournal, etc. Gmail uses "labels" which are basically just tags.
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David
Co-Founder of DailyHealth.net
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