Newton's third law is: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object.

Let's take an example of you jumping; when you try to jump on a trampoline you exert a force on it and as Newton stated that to reaction there;s an equal and opposite reaction, so this way you tend to jump again and again. 

I hope this helped!
Every action has a equal and opposite reaction is the newtons three law
the rocket is launching the fire using to move up wards while pushing down