The Invisible Web

The "invisible web" is what you cannot retrieve ("see") in the search results and other links when you use typical search engines. Most of the invisible web is made up of the contents of thousands of specialized searchable databases that you can search via the Web. The search results from many of these databases are delivered to you in web pages that are generated just in answer to your search. Such pages very often are not stored anywhere in particular.

How to Find the Invisible Web

Simply think "databases" and keep your eyes open. You can find searchable databases and other invisible web stuff in the course of routine searching in most general web directories.