Rocket is a device which produces thrust by ejecting exhausts. Unlike aircraft engines which are air-breathing engines rockets are non airbreathing engine, that can produce thrust even above earth’s visible atmosphere, that is in space.

Rockets work on the principle of Newtons’s third law of motion, which states that for every action, there is an equal and opposite reaction.. Rocket engine produces thrust by ejecting hot gases at a very high velocity.

Rockets can be classified based on the propellant as solid, liquid, or hybrid. A solid propellant rocket has both fuel and the oxidizer in solid. A liquid propellant rocket has both fuel and oxidizer in liquid. A hybrid rocket has a solid and a liquid propellant.

Russian Konstantin E.T siolkovsky published in a Russian aviation magazine, which is now known as the rocket equation. Robert Goddard sent the first liquid fuelled rocket aloft.

Rockets are made of multistages. Multistage rockets have at least two stages that have their own engines and propellants. Staging of a rocket helps to minimize the size of the rocket and reduces the cost of launch for a payload. It was also used in missions where there was a requirement for a high velocity.

When a rocket’s payload is a warhead then it is called a missile. Missiles can be classified as tactical guided missiles, strategic missiles, cruise missiles, and ballistic missiles.

Rockets are now made to be reusable. Reusable rocket helps to reduce the cost of launch. It can be used for multiple launches. Rockets are also made to carry heavier payloads. They are also made to carry and deliver multiple satellites/payloads to the space and place them in their particular orbit. Rockets are now also integrated with more advanced electronics and uses artificial intelligence.