Welcome to Screwdriver.Net
A screwdriver is a tool for the insertion and tightening of screws. Screwdrivers are made of a head, which engages with screws, a mechanism to apply torque by rotation, and some way to position the tool. Screwdrivers typically have a cylindrical handle with a shaft. The screwdriver tip is shaped to fit a particular kind of screw (eg, slotted, Phillips, Torx, Pozidriv etc). The handle and shaft allow the screwdriver to be positioned and supported and, when rotated, to apply torque.
Screwdriver tips can be rotated manually or by an electric motor. A screw has a head with a contour such that an appropriate screwdriver tip can be engaged in it in such a way that the application of sufficient torque to the screwdriver will cause the screw to rotate.
