Here's the breakdown:

* Newton's Third Law of Motion: This law states that for every action, there is an equal and opposite reaction.

* Action-Reaction Pairs: Whenever one object exerts a force on another object (the action), the second object exerts an equal and opposite force back on the first object (the reaction).

* Important Note: Action and reaction forces always act on different objects.

Examples:

* Walking: You push backward on the ground (action), and the ground pushes forward on you (reaction), propelling you forward.

* Swimming: You push backward on the water (action), and the water pushes forward on you (reaction).

* Jumping: You push down on the ground (action), and the ground pushes up on you (reaction).

Let me know if you'd like more clarification!