There are two types of models that are produced in 3D Modelling. Deformation & Non-deforming objects. This is depending on how the model is created, that's why it's important for appropriate planning before the modelling stage begins.
A deforming object is able to change its shape from being rigged. This could be for movements such as the arms and legs, if its a character or it would be the squash and stretch of a bouncy ball. The mesh of a deformable object is able to fold, bend and stretch. Providing the correct geometry is in place, it is able to do this without the model breaking and overlapping itself. This is the type of model that I'm creating for my animated character.
A non-deforming object is the complete opposite to a deforming model and is unable to change its shape. These objects would not have a rig and would be a solid mesh. This type of modelling would be used for in-animate objects such as a room, floor, non interactive type of object.
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