What is NAS?

Network-attached storage (NAS) involves using a network-connected, file-level storage server to provide data access to heterogeneous clients.

NAS definition

NAS storage systems are networked appliances containing storage drives that provide file-based storage services to devices throughout a network. This architecture allows servers to avoid the task of serving data to other servers on the network (something that occurs with direct-attached storage (DAS). To a client OS, NAS appears to be a file system. In contrast, a storage area network (SAN) appears as a disk drive.