When forces change the shape of an object, we say the object is distorted. Distortion can be elastic or inelastic.
In elastic distortion, the object goes back to its original shape and size when the forces are removed. A spring that is stretched a little and then released is a good example. A rubber band or a metal spring can both distort elastically.
In inelastic distortion, the object does not return to its original shape when the forces are removed. It stays permanently deformed. If you stretch a spring too far, it ends up longer than it started. A paper clip that is bent open and does not spring back has been distorted inelastically.
An object distorts elastically only up to a certain point. Stretch it past that point and the distortion becomes inelastic. This is why a spring can be ruined if you hang too large a load from it.