Its a tunneling tool, to share a port/etc from one computer to another. You can connect to a computer, even if you don't directly have a route to it's IP.
> Secured effortlessly by using a zero trust overlay network provided by OpenZiti
It uses OpenZiti to accomplish the links, as opposed to tailscale, zero tier, cloudflare tunnels, Yggdrasil, etc.
> zrok allows sharing other types of resources; rather than just proxying http endpoints, zrok allows users to easily and rapidly share files and web content. zrok is also ready to be extended to easily support many kinds of decentralized resource sharing; zrok provides a framework that makes this kind of peer-to-peer resource sharing simple and secure
It looks like its also extensible, so you can use it to form the communication layer to share other things, files being one example.