"Robust File Copy", is a command-line folder replication tool. It was available as part of the Windows Resource Kit, and introduced as a standard feature of Windows Vista.
Robocopy is designed for reliable mirroring of folders or folder trees. It has features to ensure all NTFS attributes and properties are copied, and includes additional restart code for network connections subject to disruption.
Robocopy is notable for capabilities above and beyond the built-in Windows COPY and XCOPY commands