The vehicle’s tail light lens covers the rear tail lights, blinkers and reverse lights. It?s most important function is to protect these bulbs from exposure to the elements and debris, and provide the color of the light for legality. They make sure the rear of the vehicle is visible to others at night and in bad weather conditions. euromotiv is your source for genuine and aftermarket tail light lenses and tail light assemblies, should you need to purchase a replacement.