Deep web is the network of all the websites, programs, bulletin boards and interactive forums that haven't been indexed by Google or any other search engines. In fact, they are intentionally configured in such a way that they can't (or won't) ever be indexed.
They are so far away from the regular mainstream that the mere existence of this part of cyberspace is in doubt.
But it does exist.
And no, you can't access it using Google, Yahoo, Bing or even DuckDuckGo, that well-known private browser. In fact, you may not even know where to start, which -- based on who you are -- is probably a good thing.
So what's so great about the Deep Web? Well, for starters, the Deep Web is the real web. It is also known by the interchangeable terms Deepnet and the Invisible Web.
More than 90% of what you believe to be the internet or world wide web is actually hidden from you -- buried in a maze of private access sites, invitation-only forums, usenets, newsgroups, legal file sharing sites and websites that need authenticated password codes just to view them.
It's a place where you can find university, government and military research PDF documents alongside obscure tomes of hidden wiki knowledge, public records, white papers, people search data, and even information about how to reverse engineer everyday things like software, services and gadgets.
This is cyberspace at its more free, democratic, unrestricted and uncensored. But it's not for everyone.
It's a below-the-iceberg world that thrives on self regulation and hence does not subscribe to the same open worldview as the mainstream search engines, which constitute just the tip of this mammoth electronic iceberg.
So how do you go about finding it?
What is it like drilling the Deep Web? What queries and semantics separate it from the schema of regular search engines and the usual protocols of inter-networked global gateways?
For those who know and understand how the Tor network works (onion router, onion sites & onion links), TorSearch and the Tor Browser are the primary starting points people use to gain access to the Deepnet.
This is equally true for anonymous web surfers who simply want to keep their IP addresses safe from government spies (read NSA) and the notorious hacking community. That's because it is highly encrypted and your searches are bounced off multiple servers to mask who you are, where you're from, and where exactly you're headed.
And this brings us to VPN a.ka. Virtual Private Network -- the most easily accessed and available encrypted network of all.
VPN is used to create a secure browsing tunnel between your computer, tablet or cell phone and the remote server. This server can be in your own country or in a foreign land thousands of miles away.
Often used by large and small companies as a fool-proof way to beat hackers and safeguard business data communications, it can also be used by regular folks to beat tracking, stay anonymous online and hide your IP address.
If you're curious about the Deepnet and want to try your hand at getting there then a VPN along with an encrypted Tor browser bundle is the best way to get started.
Both systems support military-grade encryption (VPN has higher encryption, better security) and can be configured on any internet-enabled electronic device -- PC, laptop, iPad, Android cell phones, Linux machines, etc.
The additional network protection means you have multiple, powerful layers of anonymity both inside and outside the internet.
And by internet, in this case, we mean the Deep Web. The unknown part of the "regular" internet.