The tempered glass is a hardened glass specifically designed to cover and protect your mobile screen from scratches and other damages. It does not affect the screen's functionality. In case of a drop, it does not guarantee that the screen won't break, but it offers an additional layer of protection.
It features adhesive across the entire surface, unlike edge glue glass protectors that only have adhesive on the perimeter. This contributes to better application and seamless touchscreen operation. Additionally, it prevents dust from passing underneath, which can happen with edge glue protectors when the perimeter adhesive wears out.