Why do we see the different phases of the Moon during lunar cycle.

The purpose of this video is to reveal the general facts about the lunar phases through the method of demonstration. In this video, animation of Earth rotating around the sun is demonstrated. We have discussed the spin motion of the Moon. And demonstrated why we see the same side of the Moon and why we don't see the back side of the Moon. And finally we have demonstrated why we see the different phases of the Moon during lunar cycle.