Optical drives can usually read and write to CD-RW/CD-ROM and to DVD-RW/DVD-ROM.
Optical drives built into laptops are becoming obsolete. As laptops become smaller and smaller most laptop manufacturers are leaving out optical drives. Instead USB external optical drives can be attached as needed.
The 220-1001 objectives want you to know how to do an optical drive replacement so below is an example video of how to do so:
