Tempered glasses are designed for the safety reason, they are stronger than normal glass and if it breaks accidentally it will won't break with sharp edges. These glasses are manufactured under high temperature  and rapid cooling process.

This is now compulsory in UK to have regular uses items has to manufactured using Tempered glass, Bighouse Furniture all of the Glass Table includes, Dining, Coffee, side/end tables and nest of sets using Tempered Glass, which has been clearly marked as "tempered" on every glasses.

Automobiles use a different type of safety glass for the windshield and tempered glass for the back and side windows. Windshields are made from laminated glass, which sandwiches a sheet of plastic between two panels of glass. When the windshield breaks, the glass panels stick to the plastic film, rather than falling away to possibly injure the driver or other passengers.

source..Online.