A VJ or Video Jockey creates, selects and/or manipulates video used for a real time visual art performance. The video performance goes hand in hand with, and enhances the impact of the music being played by a DJ or a Live Performer.
It’s obvious that appealing to additional senses (sight) of the audience has the potential to provide them a more profound or impacting experience.
More and more DJ and live performers create very elaborate visual shows around their music performance (ie. Eric Prydz and deadmau5 ) combining their music with not just video, but also timed light shows as well as fireworks.