Comment by omnimus

The service is free up to certain amount of connected people and devices. You most likely don't need to pay for it. I am pretty heavy user and don't. It is virtual private network orchestrator. It allows you to connect to other devices that you add to your network as long as they are connected to the internet. So your office computer, home server or NAS. If you have some home automation like home assistant you can connect to it from anywhere. That kind of stuff.