Metamorphosis is basically a process in biology. It is a process that is followed by an animal throughout his life. It is the physical development of an animal after birth. The word itself means transformation or change.
The Metamorphosis in most of the animals happens in distinct stages. It starts off with a larva or a nymph, which develops into a pupa. This pupa then develops into an adult. The insects undergo two types of Metamorphosis which are called Hemimetabolism and Holometabolism.