Why is it safer to use a Phillipshead screw and screwdriver

Why is it safer to use a Phillips-head screw and screwdriver than a conventional slotted screw and screwdriver?

Solution

Answer :

A Phillips head screwdriver has a 4 star point at the end that fits into the corresponding screw’s shallow, cross-shaped depression. This design allows a user to apply more torque than is possible with a flathead screwdriver. The depression forces the blades of the Phillips screwdriver to slip out before any damaging over-torquing can occur.