Square bits, with a square shape, are becoming more popular because they do not slip out and damage the screw very easily.
Slot bits are flat headed and are generally used for round, oval, and round fasteners.
Screwdriver insert bits are drill bits featuring a screwdriving tip. These can be used with power tools or cordless screwdrivers to drive in screws or other fasteners. The bits feature a compact design and can easily be changed out. There are also screwdriver insert bit sets coming with 21-37 different bits.