This means that:

* Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.

* These forces are of the same magnitude but act in opposite directions.

Here's a simple explanation:

Imagine you push against a wall. You are exerting a force on the wall. The wall, in turn, pushes back on you with an equal force, preventing you from falling through it.

Examples:

* When you jump, your feet push down on the ground. The ground pushes back on your feet with an equal and opposite force, propelling you upwards.

* When a rocket launches, it expels hot gas downwards. The gas pushes back on the rocket with an equal and opposite force, driving the rocket upwards.

Key Points:

* The forces always act on different objects.

* The forces are simultaneous - they happen at the same time.

* The forces are always of the same type (e.g., if you push on the wall, the wall pushes back on you).

Newton's Third Law is a fundamental principle of physics and helps explain many phenomena, including how objects move, how rockets launch, and how we are able to walk.