Define vibration?

.    VIBRATION 

           Any motion that repeat itself after an interval of time is called vibration or oscillation.

Any thing which was mass and elasticity, can vibrate with some initial disturbance. Elastic bodies such as springs, beams and shafts , beams and shafts when displaced from their equilibrium position by applying external forces,

and then released, they execute a vibratory motion.

              

   Cause of vibration

           

            Vibrations can have various causes, such as mechanical imbalances, misalignments, worn components, or external forces. Identifying the specific source depends on the context, like whether it's in a vehicle, machinery, or a structural element.