Screen filters are protective layers that can be applied to electronic devices like smartphones, tablets, and computer monitors. They help reduce glare from sunlight and artificial light, making it easier to see the screen in bright environments. Additionally, some screen filters can block harmful blue light, which may help reduce eye strain during prolonged use. These filters come in various types, including privacy filters that limit the viewing angle, ensuring that only the person directly in front of the screen can see the content. They are easy to install and can be removed without leaving residue, making them a practical accessory for many users.