meaning of deforming and non-deforming 3D objects

The real wold is full of different objects some of this objects are hard some are soft. The soft objects can bend and fold into different shapes. for example human sick will bend and stretch  around the bone joints as we move them another great example is a rubber ball it will squash and stretch as it hits the ground its soft objects can be called deforming objects. Hard objects such as a cup or glass or wood will not bend the form will never change because its a solid object, this objects are called non-deforming. 

Its very important to know the difference between this objects in the 3D world because they both have different rigs and different ways to that we need to approach the modeling stages.

That's what will be looking at next.