What is Newton 3rd law

Answer: For every action, there is an equal and opposite reaction.

Explanation: If you lay against a wall you don't fall through it because it is applying the same amount of force as you are.

A force is a push or a pull that acts upon an object as a results of its interaction with another object ... These two forces are called action and reaction forces and are the subject of Newton's third law of motion. Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction.