DVD media comes in several formats; including DVD+R (recordable DVD), DVD-R, DVD+RW (re-writeable DVD), DVD-RW.
DVD
DVD-R Life Series
DVD+R Life Series
DVD-R White Thermal
AZO DVD-R
DVD-R White Inkjet
AZO DVD+R
DVD+R White Inkjet
DVD-RW
DVD+RW
DVD-R
DVD+R DL