White Balance

White Balance is the measure of light and temperature.  The different colors are gauged on degrees of heat light, or Kelvins.  Depending on what type of mood lighting one wants for a scene the white balance is key.  

When viewing video, the whitest lights are composed of a multitude of different brightly colored lights.  However our eyes read them as white light.  Sunlight typically makes white light look blue, artificial light makes white light look orange, and fluorescent light makes white light look green.  The white balance can completely change the feel of a scene.