Plato attacked on poetry in his book Republic X whereas Aristotle defended it and refuted all the charges in his book Poetics.
Chapter XIII of Aristotle's “Poetics” gives his views on ideal tragic hero: Mixture of good and bad, noble by birth, sufferings due to hamartia, male sex
In Aristotle's concept, tragedy is catharsis of emotions such as pity and fear but word "catharsis" has nowhere been defined in "Poetics".
Aristotle's concept of imitation redefined word "imitation". He answered Plato that "imitation" is creative process and not just procedure of copying.