A CD is a disc with music or data or a program on that cannot be altered (overwritten). A CD-R is a disc that you can put information on like music or pictures ect. and once written (Burned) cannot be altered. A DVD+r or DVD-r is like a CD-r but holds a lot more stuff over 4gig compared with 700 meg on a CD.These are called writable discs A CD-RW, DVD-RW is a disc that you can burn stuff onto, but also take it off again to put different stuff on. These are called re-writable discs. I personally would not use re-writable discs, as they are not as reliable as ordinary writable discs, and prices now are very cheap.