Operating principle: Rocket engines operate according to the action-for-action principle of dynamics, based on pushing the fuel substance out and pushing it back with a symmetrical force on the rest of the system, create thrust. The fuel substance usually consists of one or more fuels and oxidizers.Engine type: There are many different types of rocket engines, including jet engines, liquid fuel engines, solid fuel engines, and ion engines. Each type has its own advantages and limitations, and is used for specific purposes in space exploration and transportation.Applications: Rocket engines are used in a variety of applications, including satellite orbiting, space exploration, spaceflight, and space tourism programs. They are also used in missile defense and anti-missile systems.Technology development: Rocket engine development has always been an important area of ​​research and development in the space industry. The goal is to create engines with higher performance, higher reliability, and lower cost, to open up new opportunities in space exploration.