Clonezilla is a free and open-source software designed for disk imaging and cloning. It allows users to create exact copies of hard drives or partitions, making it useful for backup and recovery purposes. Clonezilla supports various file systems and can be used on different operating systems, including Windows, Linux, and macOS. The software operates in a live environment, meaning it runs from a bootable USB drive or CD, ensuring that the system being cloned is not in use. Clonezilla can handle large data volumes efficiently and offers options for compression and encryption, enhancing the security and storage efficiency of backups.