Screws have things called threads and when you twist them into something, they get stuck inside. They work best with wood.
it turns like freak.
it makes it easier by doing less work for you also use a screw driverMISERABLE AT BEST♥
Screws are a more secure fastening than nails because the only barrier to removing a nail is the friction of the sides of the nail against the wood, so it can be pulled loose by a simple torsion...
a screw works better cues it has threads and a nail is just goes straight in the board. The nail is stronger but the screw holds tighter.