what's the difference between a Combo Drive and a 8x SuperDrive?

can anyone tell me what the difference is between a
Combo Drive (DVD-ROM/CD-RW)
and a
8x SuperDrive (DVD±R DL/DVD±RW/CD-RW)

I am looking at refurbished macbooks and there are two white ones listed on the apple site, but I am not sure what the difference is or which one is better?

thanks!
Kim

the superdrive can burn DVDs, the combo drive cant

THANK YOU that was a simple answer LOL!!