Drive shaft

Drive shaft:-
A drive shaft, driveshaft, driving shaft, propeller shaft
(prop shaft), or Cardan shaft is a mechanical
component for transmitting torque and rotation,
usually used to connect other components of a drive
train that cannot be connected directly because of
distance or the need to allow for relative movement
between them.
Drive shafts are carriers of torque: they are subject
to torsion and shear stress, equivalent to the
difference between the input torque and the load.
They must therefore be strong enough to bear the
stress, whilst avoiding too much additional weight as
that would in turn increase their inertia.