Kerbal Space Program is a space flight simulation game where players design and manage their own space program. Players create and build spacecraft using various parts, including engines, fuel tanks, and wings, to explore celestial bodies in a fictional solar system inhabited by Kerbals, small green humanoid characters. The game features realistic physics, allowing players to experience challenges like gravity, orbital mechanics, and aerodynamics. Players can complete missions, such as launching satellites or landing on the moon, while learning about space exploration and engineering principles in a fun and engaging way.