Screen filters are protective layers that can be applied to electronic devices like smartphones, tablets, and computer monitors. They help reduce glare from bright lights, making it easier to see the screen in various lighting conditions. Some filters also block harmful blue light, which can help reduce eye strain during prolonged use. In addition to glare reduction, screen filters can provide privacy by limiting the viewing angle of the screen. This means that only the person directly in front of the device can see the content clearly, making it harder for others to view sensitive information.