Catch-22: 'Catch-22' is a term originating from Heller's novel, representing a no-win situation or a dilemma that prevents escape due to contradictory rules, particularly highlighting the paradoxes faced by soldiers during wartime.
Satire: Satire is a literary technique that uses humor, irony, and exaggeration to criticize or mock individuals, institutions, or society, which Heller employed extensively in his writing to critique war and bureaucracy.
Absurdism:Absurdism is a philosophical perspective that emphasizes the conflict between human tendencies to seek inherent meaning in life and the cold, indifferent universe that offers none, a theme prevalent in Heller's works.