The WWW Virtual LibrarySearching the invisible web (deep web, hidden web): WebLens search portalCustom Search Locate deepweb resources by adding the word database to a regular search engine query. The terms invisible web, hidden web, and deep web all refer to the same thing: a massive storehouse of online data that regular search engines don't capture. That's because terabytes of information are buried in databases and other research resources. Searchable and accessible online but often ignored by conventional search engines, these resources exist by the thousands. Known in research circles as the deep web, invisible web, or hidden web, this buried content is an estimated 500 times larger than the surface Web, which is estimated at over eight billion pages. Need a grammar or usage tune-up for that report, essay, or homework assignment?