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Expendable launch system (ELV) An expendable launch system or vehicle (ELV) is a launch vehicle that can be launched only once. After that its components are either destroyed during reentry or discarded in space. ELVs typically consist of several rocket stages that are discarded sequentially as their fuel is exhausted. These stages are designed to burn their fuel and provide thrust during different phases of the launch. Gradual discarding occurs as the ELV ascends, each stage is discarded in sequence as its fuel is depleted. The lower stages are discarded first, allowing the upper stages to continue the ascent. The vehicle gains altitude and speed as it throws stages. Finally, the payload, which is for example satellite or spacecraft, is released into the desired orbit. Nowadays, there is trend to use them less compared to reusable launch vehicles. Companies such as SpaceX are developing rockets that can be reused for multiple launches, reducing costs and environment. However they are

What Is Rocket Staging? Staging provides method of increasing an efficiency of a rocket.  Most of the weight of the whole rocket is the weight of its actual propellant. As the propellants are burned off during liftoff, a larger proportion of the weight of the vehicle becomes the nearly empty tank and structure.  In order to lighten the weight of the rocket to achieve an orbital velocity, most rockets discard its own part in a process called staging. A multistage rocket is a launch vehicle that has two or more rocket stages, with each of them containing its own engines and propellants. The lowest stage, or the first stage, ignites and lifts the vehicle at increasing velocity until complete exhaustion of its propellant. At this point the first stage drops off and the second stage ignites and accelerates the vehicle further. Most rockets has 3 stages. credit: NASA At the beginning of the flight, only the bottom or the first stage pushes the whole rocket. After burning out, the stage drops