NFS(Network File System)
A Unix-native network file-sharing protocol offering high performance between Linux systems.
NFS is efficient and low-overhead, making it ideal for Linux-to-Linux sharing, virtualization datastores and container volumes. It has less friendly authentication than SMB, so it's usually kept to trusted networks.
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SMB(Server Message Block)
A network file-sharing protocol used by Windows, macOS and Linux to access shared folders.
NAS(Network-Attached Storage)
A dedicated storage device connected to your network that lets multiple devices store and access files centrally.