Red white and yellow are composite cables: the yellow takes the video signal and the red and white deal with the two channels of stereo sound (can't remember which is which). Component is different and uses three cables purely to carry the video signal splitting it up something along the lines of the amount of red, the amount of blue, and the brightness of the picture, which can be recombined to give a proper picture. Component video is capable of transmitting a high def signal. I think it may be quite similar to the rgb used in scart, but scart has extra pins which can also do composite video, and sound if i remember right. Andy.