Virtual drives are devices that are considered by the computer operating system to be common physical disk drives, but which in fact use disk emulations instead of the regular hardware device.
Virtual drives require specialized software to be created and they can emulate hard drives, floppy drives, CD / DVD / BD / HD DVD and network shares.
Applications that can create virtual drives provide an interface to mounting and unmounting disc image files (such as ISO), and can also process several files at the same time.