Mobile phones used to be very sensitive when it came to the screen. If you dropped it and the screen got damaged, you would have to but another smartphone. Today the story has changed; your phone’s screen is able to last a little longer thanks to gorilla glass.
First of all, there's the glass itself. Gorilla Glass is a special type of chemically strengthened material (an aluminosilicate for you material science geeks out there) that's processed in such a way as to resist scratches and other surface dings. It also withstands greater compression than standard glass, which means you have to press it (or drop it) harder to damage it.