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- Portions of the web which are not easily accessible to crawlers due to search technology limitations, copyright issues, or information architecture issues.
SEO Book - Cite This Source - This Definition
- a term that refers to the vast amount of information on the web that is not indexed by the search engines. Coined in 1994 by Dr. Jill Ellsworth.
SEO Glossary.com - Cite This Source - This Definition
- Bait-and-Switch, cache, Cloaking, De-listing, Hijacking of Websites, image map, Pull-down list