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Charge Coupled Device: The optical sensor that converts light into a digital signal. This is what many videocameras use to capture you image. A 3CCD camera has 3 CCD chips which provides for a much better image than a single CCD can provide.
The size of the CCD also matters. The larger the CCD the more information it can capture. Most "prosumer" cameras have 1/3" CCDs, whereas the mid-range professional cameras have 1/2" CCDs.