A screen protector is a thin, transparent film that is placed on top of an electronic device's screen to protect it from scratches, cracks or other damage. It acts as a barrier between the screen and any potential harm, without affecting the touch sensitivity or visibility of the display. Screen protectors are typically made of materials such as polyurethane, tempered glass or film, and come in various sizes to fit different devices. They can be easily applied and removed, making them a useful accessory for anyone who wants to keep their device's screen safe and clean.