A NAS is essentially a low power computer 'appliance' designed specifically for serving files on a network.
Usually when you buy a NAS all your buying is the appliance. You need to supply/fit the HDD(s).
You don't need a NAS necessarily for streaming without your PC being on, as Sonos can access any network share/mounted drive.
For example,
many routers have USB ports, that you can attach a HDD to and use as file server/network share, or you can even buy NAS adapters that allow you to connect any USB HDD to your network and use it as a NAS



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