Deformation is what happens when an object (like a rubber ball) changes shape because something pushes or pulls on it. When you squish a rubber ball, you are deforming it because you are pushing on it and it is changing shape. Deformation happens because the force of your push overpowers the rubber ball's natural shape. Deformation can also happen when an object is pulled or twisted. Other examples of deformation are metal when it is bent or glass when it is shaped in a new way. Deformation is a type of physics and science.