Final answer:
Elastic deformation refers to reversible deformation of a material, while ductile deformation is a type of irreversible deformation that occurs in ductile materials like metals.
Step-by-step explanation:
Elastic deformation refers to the ability of a material to return to its original shape and size after the external forces causing the deformation are removed. The material behaves elastically within its elastic limit, meaning it can be deformed reversibly. On the other hand, ductile deformation is a type of plastic deformation where the material undergoes irreversible deformation but does not break. Ductile materials, like metals, can be stretched into wires or undergo significant deformation before fracturing.