It does not come with a CD-DVD drive. The operating system comes on a USB drive. You only need the Superdrive if you have no other way to read a CD/DVD; if you have a desktop that will continue to be in service, you can share that drive to the MBP and install software that way.
Because this Macbook is so thin, there is no CD-DVD drive. The way tech is heading, most companies are scratching that off, you can download any software from the web and apple store, but in case you would need the superdrive.
You don't have to buy the Superdrive unless you want it to "match" the aesthetics of the Macbook. Even then you'll probably rarely use it so it's hard to justify the cost. Some major cons of the Superdrive:
- lack of a manual eject should a disc get stuck - only works on select Apple notebooks
I use a $30 Asus slim DVDRW that works on an Mac or PC with a USB port.