Computer key terms homework

*Hard drive: I have no idea what Hard drive is.
*Mouse:Some thing that you use to move the arrow at the computer around.
*CPU:I really don't know.
*Monitor:It's a thing that controls stuff from the computer.
*CD-Rom:It has to do with CD's
*DVD-Rom:Probably for DVD's
*Software:It operates the computer.
*Hard ware:Something hard.
*Digital:Some thing like a digital camara.
*Optical:I don't know and I can't guess.
This are all I can guess!!!