Tempered glass is a hardened glass specifically designed to cover and protect the mobile phone screen from scratches and other damages. It does not affect the screen's functionality. In case of a drop, it provides additional protection, although it does not guarantee that the screen will not break. It is 3D, meaning it has been specially processed to have curved edges, covering the entire surface of the mobile phone screen. This way, it is not noticeable that the screen has protection, while also protecting the curved edges.