Norton Ghost is a software application developed by Symantec that allows users to create backup images of their computer's hard drive. This tool is useful for protecting data by enabling users to restore their system to a previous state in case of data loss, hardware failure, or system corruption. The program works by copying the entire contents of a hard drive, including the operating system, applications, and files, into a single compressed file. Users can schedule regular backups and easily recover their data, making Norton Ghost a valuable solution for both personal and business data management.