What are two types of rocket propellant?

Two common types of rocket propellant are liquid propellant and solid propellant. Liquid propellant consists of fuel and oxidizer stored separately and combined in the combustion chamber, allowing for controlled thrust and engine shutoff. Solid propellant, on the other hand, consists of a mixture of fuel and oxidizer that is preloaded into the rocket, providing a simpler design but less control over the burn once ignited. Each type has its advantages and applications in different rocket systems.