I'm still learning, but it's peer to peer computer networking. 

Reverse TOR proxy's make me want to pull my hair out. This makes a website you run on your desktop or Start9 available to other computers using public key cryptography.

In other words, you can launch a Minecraft server with three lines of code.

 Or....An LNbits instance with a TPOS  and a Jukebox at a brewery that accepts bitcoin. 😁 

 Check out this podcast to learn more.

https://fountain.fm/episode/MyIucEf5hVoN3xsQmhbg