CCD 
Charge Coupled Device. 
A high quality image sensor 
commonly found in video equipment.
CMOS 
Complementary Metal Oxide Semiconductor. 
A medium quality image sensor 
used in digital cameras 
and many low-powered image devices such as USB webcams.
Infrared (IR) 
Infrared night vision 
allows cameras to ‘see in the dark’, or in low-light conditions, 
using IR LEDs (Infrared Light Emitting Diodes) as illumination for a camera.