tempered glass is a toughened 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 your phone drops, there is no guarantee that the screen will not break, but it provides added protection.
Made with adhesive across the entire surface, unlike edge glue screen protectors that only have adhesive around the perimeter. This helps with better application and seamless touch screen operation. Additionally, it prevents dust from entering underneath, which can happen with edge glue protectors when the perimeter adhesive wears out.