NFS (Network File System) is a network protocol that allows a computer to access files over a network as if they were on its local hard drive. An NFS server is a computer or device that is running NFS and provides access to its file system over a network to NFS clients. This allows NFS clients to access and manipulate files on the NFS server as if they were stored locally on their own computers. NFS servers are often used in enterprise environments to allow multiple users to access and share files over a network, and can be configured to provide different levels of access to different users or groups of users.