invisible Web
Definition
The portion of the Web not accessible through Web search engines.
Information
The invisible Web sounds very mysterious, but surfers visit it regularly, perhaps without even realizing it. "Invisible" Web pages are
often dynamic pages within database-driven sites, whereas much of the
"surface Web" consists of static pages. The URLs can often
be identified by symbols such as the question mark (?).
Search engines are well aware of the invisible Web, but limitations
in time and money could make it unfeasible to index all of the dynamic
page possibilities. Even if resources were no issue, dynamic pages tend
to present more challenges than static pages in terms of ranking useful
results.
Most of the dynamic, database-driven sites in question do feature site
search, so unearthing information becomes much easier if you can pinpoint
the most appropriate site to search.
Synonyms
deep Web
Related Terms
search engine
Products
The Invisible Web: Uncovering Information Sources Search Engines Can't See (book)
by Chris Sherman, Gary Price
Sites
CompletePlanet - directory of searchable databases.
Google : Search Engines : Specialized
Articles
Invisible Web Gets Deeper
Search Engine Watch (August 2, 2000)
Study Says Web Is 500 Times Larger Than Major Search Engines Now Show
CNN.com (July 27, 2000)
Invisible Web Revealed
Search Engine Watch (July 6, 1999)
Invisible Web: What it is, Why it exists, How to find it, and Its inherent ambiguity
berkeley.edu
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