Difference between NAS, SAN and DAS

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DAS
NAS
SAN
I apologize for the short question but what's the difference between a SAN, NAS and DAS? Is there really any difference?
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Direct-attached storage (DAS) is storage directly attached to the computer accessing it.  For example, a USB drive.

Network-attached storage (NAS) is a file-level data storage server connected to a computer network providing data access to a heterogeneous group of clients.

A storage area network (SAN) is a dedicated network that provides access to consolidated, block level data storage.

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