If you ever have a .BIN or a .CUE CD image created by a non-unix CD Burning software which is not supported on most CD Burning software then “bchunk” can help you to convert these .BIN or .CUE files into a standard ISO image or a .CDR image file which can then be mounted or edited or burned with a CD Burning software that supports ISO or .CDR images.
A .BIN file is a raw CD image file while .CUE is the track index file containing track types and offsets.
You can mount an ISO image onto your operating system instead of burning it onto a CD or a DVD. This can come handy and easy in situations and there you have the advantage of not wasting a media. A classic example would be when setting up a Jumpstart setup.
md5sum is a builtin utility in openSUSE to verify if a file is reproduced exactly the same as the original. For instance, most if not all of the website from where you download files especially ISO files of operating systems for instance, they offer the MD5 Checksum files to cross verfiy that the download is not being tampered with or if there is a corrupted download. Another instance, would be a file copy where the same verification applies.