The Tor Tool

The Tor encryption tool

Because the web pages on the Dark Web are encrypted with Tor those  who use it must use a special browser.

Dark Web users access those sites using the Tor Browser.  There are other encryption tools and corresponding browsers such as 12p (these are not universal, by design) and you have to know the exact URL in order to access the site. There's no "Google" for the Dark Web because that kind of indexing would provide a breadcrumb trail for investigators.

Another layer of anonymity involves the way payments are processed. Silk Road, for example, only accepted payment via Bitcoin, which is an unregulated cryptocurrency. As with the Dark Web generally, there's nothing illegal about using Bitcoin. But the anonymity of Bitcoin payments is attractive to those making illegal transactions.

https://www.torproject.org/download/   however I do not recommend downloading TOR to your computer system.  This you do at your own risk.  The very fact that you download TOR maybe noticed by those who are interested in knowing who is possibly going to be using it.  Check with your I.T. staff and with their work, setup a stand-alone computer with a VPN connection to use.