Windshield add-ons are items that can be added to a car's windshield to improve visibility, reduce glare, and protect the driver from the sun. One such add-on is tinting, which is a five-letter word that can be used to describe the process of adding a dark film to the windshield to reduce the amount of light that passes through it. Tinting can also be used to reduce the amount of heat that enters the car, making it more comfortable for the driver.