Why is the narrator Red rather than Andy?

In "The Shawshank Redemption," the narrator is Red rather than Andy to provide a grounded perspective on life inside Shawshank Prison. As an inmate with a long sentence, Red offers insights into the realities of prison life and the struggles of hope and despair. His reflections on Andy’s journey highlight the transformative power of friendship and resilience, making Andy’s story even more impactful through Red’s eyes. This narrative choice emphasizes the themes of redemption and the human spirit.