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 screen's functionality. In case of dropping the phone, it does not guarantee that the screen won't break along with it, but it offers an additional layer of protection. It features adhesive across the entire surface, unlike edge glue glass protectors that only have glue around the perimeter. This helps with better application and hassle-free touch screen operation. Additionally, it prevents dust from passing underneath, which can happen with edge glue protectors when their perimeter adhesive wears out.