Way of storing images.
YCbCr is a component color space used by most digital video tape recorders to record video to tape. Unlike the RGB model, YCbCr breaks the visual information into black and white (luma) signal and two color components.
Practical implementations of YCbCr take into account that human eye is less sensitive to color stimulus than black and white stimulus reduce the amount of information contained by color components.
For example, D5 VTR utilizes 4:2:2 color subsampling which means there is only half as much color information as black and white information.
YCbCr is a color space related but not equivalent to YUV color space.