Solid propellants are used in rocket motors and help to generate thrust to lift payloads into space. They are a critical component of rocket launches and are often made up of a combination of ingredients that burn slowly to produce the required thrust. There are several synonyms for the term "solid propellant," including rocket fuel, solid rocket propellant, and solid rocket fuel. Other common terms include "boosters," "solid boosters," or simply "propellants." These terms are all used to describe the same basic component of a rocket system, and are often used interchangeably by scientists and engineers working in the aerospace industry.