What Is the Dark Web? How Do I Find it?

If you think search engines like Google and Bing let you probe the entire web, you’re totally wrong. You’re barely scratching the surface of the web—literally. Below the web’s outer crust—the one you’re accessing right now to read this article—flows other layers of the internet that you can’t find through search. But with a little bit of know-how, anyone can dive into the web’s deep end to find some hidden treasures (and perhaps a bit more than that). Here’s a quick guide to the deep web, the dark web, and what you’ll find when you get there.
What is the dark web?
There are basically three parts to the world wide web: surface web, deep web, and dark web.
The surface web is everything that’s publicly available and accessible through search or typing a URL into your browser. The deep web, also known as the invisible web, is all the content on the web that is not indexed by standard search engines, such as email clients, online banking websites, or pages that are inaccessible to crawlers, the software that indexes the web for search engines. Some of those pages can still be accessed if you have the URL while others require you to have login credentials. According to expert estimates, the deep web is 500 times larger than the surface web.
ref: https://www.dailydot.com/layer8/what-is-dark-web/