Metamorphosis refers to a profound change or transformation in form, structure, character, nature, etc. It is often used to describe a significant and irreversible shift from an old state to a new one. The term is commonly associated with biological processes such as the transition of caterpillar into a butterfly during its metamorphosis stage or the transformation of a tadpole into a frog. However, it can also be used in a broader sense to describe changes in human behavior, societal norms, and other non-biological phenomena.