Add Onion Service path overview diagram

docs/advanced/tor-overview.md

@@ -6,9 +6,9 @@ description: Tor is a free to use, decentralized network designed for using the
 
 Tor is a free to use, decentralized network designed for using the internet with as much privacy as possible. If used properly, the network enables private and anonymous browsing and communications.
 
-## Path Building
+## Path Building to Clearnet Services
 
-Tor works by routing your traffic through a network comprised of thousands of volunteer-run servers called nodes (or relays).
+"Clearnet services" are websites which you can access with any browser, like [privacyguides.org](https://www.privacyguides.org). Tor lets you connect to these websites anonymously by routing your traffic through a network comprised of thousands of volunteer-run servers called nodes (or relays).
 
 Every time you connect to Tor, it will choose three nodes to build a path to the internet—this path is called a "circuit." Each of these nodes has its own function:
 
@@ -37,7 +37,19 @@ The exit node will be chosen at random from all available Tor nodes ran with an
 <figure markdown>
   ![Tor path](../assets/img/how-tor-works/tor-path.svg#only-light)
   ![Tor path](../assets/img/how-tor-works/tor-path-dark.svg#only-dark)
-  <figcaption>Tor circuit pathway</figcaption>
+  <figcaption>Tor circuit pathway with exit node</figcaption>
+</figure>
+
+## Path Building to Onion Services
+
+"Onion Services" (also commonly referred to as "hidden services") are websites which can only be accessed by the Tor browser. These websites have a long randomly generated domain name ending with `.onion`.
+
+Connecting to an Onion Service in Tor works very similarly to connecting to a clearnet service, but your traffic is routed through a total of **six** nodes before reaching the destination server. Just like before however, only three of these nodes are contributing to *your* anonymity, the other three nodes protect *the hidden service's* anonymity, hiding the website's true IP and location in the same manner that Tor Browser is hiding yours.
+
+<figure style="width:100%" markdown>
+  ![Tor path](../assets/img/how-tor-works/tor-path-hidden-service.svg#only-light)
+  ![Tor path](../assets/img/how-tor-works/tor-path-hidden-service-dark.svg#only-dark)
+  <figcaption>Tor circuit pathway with hidden services. Nodes in the <span class="pg-blue">blue</span> fence belong to your browser, while nodes in the <span class="pg-red">red</span> fence belong to the server, so their identity is hidden from you.</figcaption>
 </figure>
 
 ## Encryption