Analog video is a video signal encoded as a continuous waveform, not as discrete digital bits. Common examples include composite video, component video, and older broadcast or CCTV feeds. Because the picture is carried by changing voltage or radio/light intensity over time, the signal can be viewed, measured, and altered directly at the physical layer.
In cyber security, that matters because analog video is often easier to tap, replay, jam, or inject than encrypted digital video. An attacker with access to a cable, connector, or receiver path may capture frames, add noise, or substitute a false image without needing to break software protections. Defenders reduce risk with short and shielded runs, controlled access to ports, signal conversion to secure digital links, and monitoring for interference or unexpected source changes. Analog video is a reminder that security depends on the transmission medium as much as on the device.