Launch vehicles are powerful rockets designed to transport payloads, such as satellites or spacecraft, from Earth's surface into space. They work by generating thrust through the combustion of fuel, allowing them to overcome Earth's gravity. Launch vehicles come in various sizes and configurations, depending on the mission requirements and the weight of the payload. These vehicles typically consist of multiple stages, each designed to operate at different altitudes and speeds. Once a stage has expended its fuel, it is jettisoned to reduce weight, allowing the remaining stages to continue the journey. Notable examples of launch vehicles include the SpaceX Falcon 9 and the NASA Space Launch System (SLS).