A rocket launcher is a device designed to launch rockets into the air. It can be used for various purposes, including military applications, space exploration, and scientific research. Rocket launchers can vary in size and complexity, from portable systems used by soldiers to large installations used for launching satellites into orbit. These launchers work by igniting fuel within the rocket, creating thrust that propels it forward. Some well-known examples of rocket launchers include the Javelin anti-tank missile system and the SpaceX Falcon 9, which is used to send payloads into space.