The tempered glass is a hardened glass specifically designed to cover and protect your mobile phone's screen from scratches and other damages. It does not affect the functionality of the screen.
In case of a fall, it cannot guarantee that the screen will not break along with it, but it provides additional protection.
It features adhesive over the entire surface, unlike edge glue glass protectors which only have glue on the perimeter. This helps with better application and smooth operation of the touch screen. Additionally, it prevents dust from passing underneath, which can occur with edge glue protectors when the adhesive on the perimeter wears out.