Robocopy is a command-line tool in Windows used for copying files and directories. It stands for "Robust File Copy" and is designed to handle large data transfers efficiently. Unlike standard copy commands, Robocopy can resume interrupted transfers, copy over network connections, and maintain file permissions and timestamps. This tool is particularly useful for backups and mirroring directories. It offers various options, such as filtering files by size or date, and can log its operations for review. Robocopy is included in Windows operating systems, making it accessible for users needing reliable file management solutions.