National park :-
⇒ They are formed by Central or State Legislation.
⇒ It is meant for protection of both flora and fauna.
⇒ boundary is well demarcated.
⇒ Ex. corbett national park.
Wildlife sanctuary :-
⇒ They are formed by the order of State or Central Government.
⇒ It is meant for protection of only fauna.
⇒ Boundary is not well demarcated.
⇒ Ex. Chilika-Nalaban Sanctuary.