Functions of a screw??

my question is exactly that: what are the functions of a screw? if you have website names that would be great.

a screw is a fastner, ie it fastens 2 pieces of material together
The function of a screw is to bore, to auger, to hold objects into place.
There are many functionf for a screw. A screw by definition is an inclined plane rapped around a silinder. Or do you want the mathmatical equations for a screw like effort needed or finding MA.

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