A video signal is the data that makes up the visual portion of a transmitted video/television program, for example:
- The output of a video camera, DVD player, computer graphics card, etc.
- The modulated waveform of a television broadcast.
- The data stream used in digital transmission or streaming applications.
A video signal can be thought of as a stream of data flowing through a path in the same way as water flowing through a pipe. Although this is not a technically accurate analogy, it is a practical one.
Note: In some systems the video and audio signals are combined together, but in most systems they are kept separate.