CCD is Charge Coupled Device
CMOS is Complementary Metal Oxide Semiconductor

CCD converts light into electrical signals of an analogue magnitude proportional to the light intensity.  A camera consists of a large matrix of CCD and together these CCD convert the light passing through the camera lens to form an image of an object or scenery like a bit map.  CCD technology is still current as of 2008 due to the high sensitivity to light and is commonly used in digital photography. 

CMOS is an integrated circuit of transistors and each transistor has an ON and OFF state only.  Ignore the complicated name of the material used and just interpret CMOS as a type of light sensors based on digital representations.  CMOS is more modern and cheaper to make than CCD for camera use, but is not necessarily more superior than CCD as far as sensitivity to light is concerned.  We have to assess the quality of a camera in terms of many other factors.