Call it the “deep web” or “hidden web” or “invisible web”, the portion of the web that does not get indexed is often ignored by internet users. A good reason why is that there is a prevailing notion that “you can find everything with Google”. With my 10+ years of experience, I know that the mindset is completely FALSE.
I could use this post to explain the nuances of the invisible web however; this Wikipedia entry does an excellent job of discussing why billions of pages and files go undetected by major search engines.
In order to hone your skills for invisible web searching, knowing the various gateways or subject specific indexes is a good start. I urge you to take a look at the following resources:
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