When an object returns to its original shape and size after stress it removes?

When an object returns to its original shape and size after the removal of stress, it is exhibiting elastic behavior. This occurs when the material is able to deform temporarily under an applied force but regains its initial configuration once the force is removed. This property is characteristic of elastic materials, which can absorb energy during deformation and release it upon recovery. In contrast, if the deformation is permanent, the material is considered to have undergone plastic deformation.