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Its worth sharing , qouted from Invisible Web: uncovering information sources search engines can't see , by Chris Sherman and Gary Price
Title: Web Directories
"Web directories, such as Yohoo! LookSmart and the Open projects are collections of links to Web pages and site that are arranged by subjects. They are typically hierachical in nature, organized into structure that classifies human knowledge by topic, techinically known as ontology. These ontologies often resemble the structure used by traditional library catalog systems, with major subject areas divided into smaller, more specific subcategories. Directories take advantage of the power of hypertext, creating a clickable link for each topic, subtopic and ultimate end document allowing the user to successively drill down from broad subjects category or specific documents".
Don't forget to acknowledge where you got your information (your source), otherwise it is plagiarism.
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