Why do the moon go through a cycle of phases?

The Moon goes through a cycle of phases due to its position relative to the Earth and the Sun. As the Moon orbits the Earth, different portions of its illuminated side become visible from our perspective, creating phases such as new moon, crescent, first quarter, gibbous, and full moon. This cyclical pattern occurs approximately every 29.5 days, known as a lunar month. The changing angles of sunlight hitting the Moon are responsible for the varying appearances we observe.