Rocket launch vehicles are powerful machines designed to transport payloads, such as satellites or scientific instruments, into space. They work by burning fuel to produce thrust, which propels them upward against Earth's gravity. These vehicles can be categorized into different types, including expendable and reusable rockets, depending on whether they can be used multiple times. The structure of a rocket launch vehicle typically includes stages, which are sections that detach as fuel is consumed. This design helps reduce weight and allows the remaining stages to accelerate further into space. Notable examples of rocket launch vehicles include the SpaceX Falcon 9 and the NASA Space Launch System (SLS).