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Encyclopedic overview
A five-bay NAS server
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. In this context, the term "NAS" can refer to both the technology and systems involved, or a specialized computer appliance device unit built for such functionality – a NAS appliance or NAS box. NAS contrasts with block-level, storage area networks (SAN) and direct-attached storage (DAS).
Excerpted from Wikipedia’s “network-attached storage” article, available under the CC BY-SA 4.0 licence.