A two-stage rocket system consists of two separate sections, or stages, that work together to launch payloads into space. The first stage provides the initial thrust needed to lift the rocket off the ground and through the atmosphere. Once the fuel in the first stage is depleted, it detaches and falls away, allowing the second stage to ignite and continue the journey into orbit or beyond. The second stage is designed to operate in the vacuum of space, where it can accelerate the payload to its final destination. This design improves efficiency, as each stage can be optimized for its specific phase of flight, reducing overall weight and increasing payload capacity. Examples of two-stage rockets include the Saturn V and the Falcon 9.