Tempered glass is a hardened glass specifically designed to cover and protect your phone's screen from scratches and other damage. It does not affect the screen's functionality. It is 3D, meaning it has undergone special processing to have curved edges that cover the entire surface of your phone's screen. This way, it is not noticeable that the screen has protection, and the curved edges are also protected. It is compatible with Galaxy A23 4G/5G.