There is more content out there than any conventional browser can access. These sites are termed "Deep Web" or "Undernet." They exist outside the scope of Google, Facebook, and your RSS reader. It's the digital equivalent of a thriving city that's been domed over and cordoned off.
These sites are locked down so tightly that you need a special browser to access them. It's called the Tor browser, and it offers you an entirely new way of connecting to the Internet.
Where conventional web browsers like Chrome and Firefox make no effort to conceal your location or identity, Tor is built upon the idea of preserving anonymity as aggressively as possible.
What is Tor?
Tor, originally an acronym for "The Onion Router," is an anonymity network designed to keep your identity and location completely secure as you browse the web. When you use the Tor browser (a free download), volunteer servers around the world route your internet traffic from server to server before finally delivering you your content. On top of this evasive routing, data is encrypted a number of times as it travels to you.