Network-attached storage (NAS) is a file-level computer data storage server connected to a computer network providing data access to a heterogeneous group of clients. NAS is specialized for serving files either by its hardware, software, or configuration. It is often manufactured as a computer appliance – a purpose-built specialized computer.[nb 1]
In comparison to an external hard drive that you connect to you computer via USB cable is called a DAS or direct attached storage. A NAS can be used to store and share files across and network. A NAS can also have a UPnP server installed allowing it to push media onto a network for UPnP streamers like the ARIES to access and playback from. A NAS drive in a UPnP streaming system is essentially your music source.
For more information, please refer to the original article on Wikipedia: