1. What is the Deep Web?
Deep Web also called Hidden Web or Invisible Web is basically the search of all pages that are not indexed by the popular "safe" to our eyes Search Engine I mention above. Some of these site are excluded by the normal Search Engine because doesn't respect their Guidelines or these pages doesn't have the requirement to give a better experience to visitors. A full list of the method which prevent to be index are available on Wikipedia.https://en.wikipedia.org/wiki/Deep_web_(search)
2. Dark Web or Deep Web are not the same!www.rawscience.tv
Yes, we talk about Deep Web, Hidden Web but do not confuse these with the Dark Web. The Dark Web let user surf page without being tracked using special browser such TOR (The Onion Browser) and is definitely much smaller of the Deep Web, even if part of it.
The Dark Web is used to sells and buys illegal items, services, in fact, you easily can be purchased on forums stolen credit cards (for just 1$), of course, will be used an anonymous currency such as the BitCoins.
3. The Memex software aims to include the dark web in its search
The Government is developing a custom Search Engine to scan the Dark Web and keep tracking of sources around the internet, saving tons of times to Police departments and discover Drugs Dealer and illegal activities. The Memex software not been a commercial Search Engine such Google and Yahoo / Bing will be not available to us.
4. Deep Web Search Engine
Check the external link below for more Deep Web Research Tools
5. How Deep Web Search Engine works?
There are many Deep Web Search Engine, and these work as same of a typical search engine such Google, but it scan and look for .onion extension resolving these kind of links. After find these link the search engine output the link to the regular browser but remember to access these link to must have a browser such TOR .