A solid rocket is a type of rocket propulsion system that uses solid propellant to produce thrust. Unlike liquid rockets, which rely on liquid fuel and oxidizer, solid rockets contain a mixture of fuel and oxidizer in a solid form. When ignited, the propellant burns from the inside out, generating hot gases that are expelled through a nozzle, propelling the rocket forward. Solid rockets are commonly used in various applications, including space launch vehicles like the Space Shuttle and military missiles. They are known for their simplicity, reliability, and ability to provide a large amount of thrust in a short time, making them effective for launching payloads into space.