What propellant is used to launch a rocket?

Rockets typically use a variety of propellants, which can be broadly categorized into liquid and solid types. Liquid rockets often use a combination of liquid fuel (like liquid hydrogen or RP-1) and an oxidizer (such as liquid oxygen). Solid rockets utilize a preloaded mixture of fuel and oxidizer in a solid form. The choice of propellant depends on the mission requirements and rocket design.