An example of Newton's third law of motion in action can be seen when a person jumps off a small boat into the water.
As the person pushes down and back against the boat (action), they exert a force on it. According to Newton's third law, the boat will push back with an equal and opposite force (reaction). This causes the boat to move in the opposite direction from where the person jumped.
In this case, while the person moves forward into the water, the boat moves backward, illustrating the concept that for every action there is an equal and opposite reaction.