A CD is write to only , usually about 650meg space , Cannot edit or delete anything from a CD . A DVD usually has like 3-4 gigs. room which handles videos rather well or you can stream movies to it . Cannot edit or delete files from DVD .
On the other hand if you wish to edit or delete or re-write files then you must use a CDRW or a DVD-RW . Both of those allow deleting or editing anything on the disc or you can completely erase the contents and add all new data . However if you Completely Wipe the disc the disc is usually good for just a few add and wipe processes then it gets' to where it might corrupt or just stop allowing you to rewrite or edit .
Also on a DVD-RW if you want best quality data use the Blu-Ray version disc but make sure your computer is capable of writing to a Blu-Ray disc , if not then you'll need to use a regular DVD-RW as long as your computer can write to a DVD disc .