Background SMB (Server Message Block) is a network file-sharing protocol used for sharing files, printers, and other resources between computers on a network. SMB is primarily used in local area networks (LANs), providing high performance and low latency file transfer and sharing services without complex network configuration, making it suitable for office, home network, and other scenarios. In practice, for cross-regional collaboration and the popularity of remote work, accessing shared resources over the Internet is often necessary.