Here's how it works:

1. Pushing Back: When you walk, you push your foot backward against the ground. This creates a force in the opposite direction, known as static friction.

2. Newton's Third Law: Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. The ground responds to your push by pushing back on your foot with an equal and opposite force.

3. Forward Momentum: This force from the ground, acting in the direction you want to move, is what propels you forward.

Important Note: Friction is essential for walking. Without it, your foot would slip on the ground, and you wouldn't be able to move.