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Newton’s third law of motion

1. The law states that ‘To every action, there is an equal and opposite reaction’.
2. When one object exerts a force on another object, instantaneously the second object exerts a force back on the first object. These two forces are always equal in magnitude, but opposite in direction.
3. The force exerted by the first body on the second is called action. The force exerted by the second body on the first body is called reaction.

Explanation:

1. When two equal forces act on the same object in opposite directions they get canceled. Even though action and reactions are two equal forces in the opposite directions they act on different bodies, therefore they do not get cancelled.

In the above figure it is clearly visible that both forces act on different objects which would not cancel out each other.

Hence , Action and Reaction do not cancel out each other.