It is called the "Hidden Web", the "Invisible Web" or even the "Deep Web". It sounds mysterious, maybe a bit scary. What is it? The Hidden Web (HW) is more than 500 times larger than the known (or indexed) portion of the web. The HW is the largest growing category of new information on the Internet. About 95 percent of this content is accessible and is not fee based. In 2003, more than 100 000 HW sites existed, and there are more of them now. So, why Google, Altavista or any of the other commercial search engines do not index the entire World Wide Web?
Actually, there are different types of deep ressources : dynamic content, unlinked content, private web, contextual web, limited access content, and so on. So, how can we access all these informations ? Bye-bye Google! You have to use something else to search the invisible web. Here are some tools: the Librarians' Internet Index, Genius Find, but it exists a lot of them. I let you discover by yourself this whole new world.
MM
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