A light box is a lighting product that is a three-dimensional structure with a front surface made of a translucent material (transmitting light), with sidewalls and a back (rear) surface made of metal or PVC (polyvinyl chloride) plastic. A light source is installed inside the light box, which illuminates the front surface. Light boxes are widely used in both outdoor and interior advertising. This type of sign is perfectly visible both during the day and at night, thanks to the internal illumination.