What is the Volumio hotspot?


Sometimes my Volumio (RPi3 with Hifiberry AMP+) fails to connect to my WiFi despite a strong WiFi signal. If and only if that happens I can see a “Volumio” hotspot in the list of WiFi networks available.

I haven’t been able to find info on this. Questions:

What does this “Volumio” hotspot do; what is it useful for?
What does it give access to?
Any security implications?