Also known as “invisible web”, the term “deep web” refers to a vast repository of underlying content, such as documents in online databases that general-purpose web crawlers such as Google cannot reach. The deep web content is estimated at 500 times that of the surface web, yet has remained mostly untapped due to the limitations of traditional search engines.
Since most personal profiles, public records and other people-related documents are stored in databases and not on static web pages, most of the higher-quality information about people is simply “invisible” to a regular search engine. Deep Web directories under development include as OAIster at the University of Michigan, Intute at the University of Manchester, INFOMINE at the University of California at Riverside, and DirectSearch (by Gary Price).
Check out both of these deep search resources, Pipl search. OAIster search.
There are many domain-specific portals into the deep web. Here are a few portals that search databases specific to a topic:
http://www.mednar.com medical research
http://www.biznar.com business research
http://www.science.gov scientific information
http://www.worldwidescience.org scientific information
http://www.scitopia.org scientific information
http://www.nutrition.gov nutrition and health
These sites return pertinent information that cannot be reached by crawlers.
Terry
Thank you Terry for the added links you’ve provided. So much information so little time.
Scott