Optical Drive and the Video Card
In computing, an optical disc drive (ODD) is a disk drive that uses laser light or electromagnetic waves within or near the visible light spectrum as part of the process of reading or writing data to or from optical discs.
Basically, an optical drive reads the tiny data bumps on disks including CDs and DVDs, but it can also 'write' on them too. Some examples of optical drives are Blu- ray drives, CD- ROMs and DVD- ROMs.
The Video (Or graphics) Card
The Video/ Graphics card is a special circuit board that controls how your screen looks. It is attached to the motherboard (the main part of a computer).
Without this card, we wouldn't be able to see anything on the screen.
A faster video card will produce clearer images much more quickly, and these often have their own memory chip inside.
Special gaming computers will have a better video card to enhance their gaming performance. These are often very expensive, ranging anywhere from £500+
Gaming Desktops (video cards): http://www.dell.com/uk/p/alienware-x51-r2/pd?oc=d00ar244&model_id=alienware-x51-r2
What's inside an Optical Drive?