Ender's Game is a science fiction novel written by Orson Scott Card. It is set in a future where humanity is at war with an alien race known as the Formics. The story follows Ender Wiggin, a young boy who is recruited by the military to train in a battle school in space. Ender quickly proves to be a tactical genius and becomes a key player in the war against the Formics. The book explores themes of leadership, morality, and the consequences of war.