Composite Video is a type of video signal that combines all the video information into a single channel. This means that the brightness, color, and synchronization data are all sent together, making it simpler to connect devices like VCRs and TVs. The most common connector for composite video is the yellow RCA plug, which is often found alongside red and white plugs for audio. While composite video was widely used in the past, it has limitations in terms of picture quality compared to newer formats like S-Video or HDMI. The merging of all video data can lead to issues like color bleeding and reduced sharpness, making it less ideal for high-definition displays.