Solid rockets are propulsion systems that use solid propellant to generate thrust. The propellant is a mixture of fuel and oxidizer, which burns in a combustion chamber. Once ignited, the reaction produces hot gases that are expelled through a nozzle, propelling the rocket forward. Solid rockets are known for their simplicity and reliability, making them popular for various applications, including space launches and military missiles. Unlike liquid rockets, which require complex fuel systems, solid rockets are easier to handle and store. They can be quickly launched and are often used in booster stages, such as those found in the Space Shuttle program. Their design allows for a high thrust-to-weight ratio, enabling efficient lift-off and acceleration.