Ender's Game, written by Orson Scott Card, is a military science fiction novel set in a future where humanity is at war with an alien species known as the Formics. The story follows Ender Wiggin, a young boy who is recruited into an elite military training program to prepare for the next alien invasion. With its strategic battles, complex characters, and exploration of morality and empathy, Ender's Game is a gripping adventure that delves into the psychological and ethical challenges of warfare.