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dd is a command-line utility used to copy data to and from files. Since Linux treats many external devices (including USB drives) as files, this makes dd very powerful. For example, the tool can be used to create a backup image of your hard drive and store it as a file which can be uploaded to cloud storage. dd could also be used to directly clone one drive to another, write a bootable iso image to a USB drive, and much more. implementation will copy data from an input file to an output file in a manner specified by its arguments.