http://www.practicalecommerce.com By Brian Getting 10/22/07
What Are “Tags” And What Is “Tagging?”
The first type of tagging, which I am calling public tagging, creates a situation where visitors to a site can add and manage their own tags for content. In contrast to traditional categorizing and other indexing techniques, public tagging allows visitors to freely choose the keywords that describe content, which means that the consumers of the content are the ones that determine its relevance. A good example of public tagging can be found at some of the social bookmarking sites that have made tagging so popular, such as Digg.com, Del.icio.us, and 9rules.com.
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